{"product_id":"smfy-pst-wsd400h","title":"Wi-Fi Temperature and Humidity Sensor with Screen — PST-WSD400H","description":"\u003carticle class=\"smfy-catalog-v5\" lang=\"en\" dir=\"ltr\" data-smartify-theme=\"adaptive-v1\"\u003e\u003cnav class=\"sd-nav\"\u003e\u003ca href=\"#pst-wsd400h-en-overview\"\u003eOverview\u003c\/a\u003e\u003ca href=\"#pst-wsd400h-en-requirements\"\u003eBefore you start\u003c\/a\u003e\u003ca href=\"#pst-wsd400h-en-specs\"\u003eSpecifications\u003c\/a\u003e\u003ca href=\"#pst-wsd400h-en-usage\"\u003eUsage guidance\u003c\/a\u003e\u003ca href=\"#pst-wsd400h-en-faq\"\u003eFAQs\u003c\/a\u003e\u003c\/nav\u003e\u003cdiv class=\"sd-intro\" id=\"pst-wsd400h-en-overview\"\u003e\u003ch2\u003eKnow the room conditions, set alerts your way\u003c\/h2\u003e\u003cp\u003eCheck temperature and humidity on the screen or your phone, and choose limits that suit your room. PST-WSD400H gives you clear readings and a history in Smart Life, with a choice of two AAA batteries or USB-C power.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv class=\"sd-features\"\u003e\u003csection\u003e\u003csvg viewbox=\"0 0 100 100\" fill=\"none\" stroke=\"#65afe5\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003ccircle cx=\"50\" cy=\"50\" r=\"34\"\u003e\u003c\/circle\u003e\u003cpath d=\"M50 25v25l20 12\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003ch3\u003eReadings right in front of you\u003c\/h3\u003e\u003cp\u003eThe screen displays temperature and humidity, with a choice of °C or °F.\u003c\/p\u003e\u003c\/section\u003e\u003csection\u003e\u003csvg viewbox=\"0 0 100 100\" fill=\"none\" stroke=\"#65afe5\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M25 65V40a25 25 0 0 1 50 0v25l10 12H15ZM40 86h20\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003ch3\u003eAlert limits for your space\u003c\/h3\u003e\u003cp\u003eSet upper and lower limits and receive app alerts, with an option to mute the buzzer.\u003c\/p\u003e\u003c\/section\u003e\u003csection\u003e\u003csvg viewbox=\"0 0 100 100\" fill=\"none\" stroke=\"#65afe5\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M15 35q35-30 70 0M25 48q25-22 50 0M37 61q13-12 26 0\"\u003e\u003c\/path\u003e\u003ccircle cx=\"50\" cy=\"76\" r=\"5\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003ch3\u003eSee how conditions change\u003c\/h3\u003e\u003cp\u003eReview the reading history in the app to follow changes throughout the day.\u003c\/p\u003e\u003c\/section\u003e\u003csection\u003e\u003csvg viewbox=\"0 0 100 100\" fill=\"none\" stroke=\"#65afe5\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 80h60M30 65V25h40v40M40 35h20M40 48h20M45 65v15M55 65v15\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003ch3\u003eFlexible power and placement\u003c\/h3\u003e\u003cp\u003eUse two batteries or USB-C power, and wall-mount the sensor or place it horizontally.\u003c\/p\u003e\u003c\/section\u003e\u003c\/div\u003e\u003csection class=\"sd-use\" id=\"pst-wsd400h-en-requirements\" tabindex=\"-1\"\u003e\u003ch3\u003eWhat you need to get started\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eTwo LR03 AAA batteries supplying DC3V in total, or USB-C DC5V power.\u003c\/li\u003e\u003cli\u003eA 2.4GHz Wi-Fi network and Smart Life or Tuya Smart.\u003c\/li\u003e\u003cli\u003ePlace it away from heat sources and ventilation outlets for readings that reflect the room conditions.\u003c\/li\u003e\u003c\/ul\u003e\u003c\/section\u003e\u003csection class=\"sd-specs\" id=\"pst-wsd400h-en-specs\"\u003e\u003csection\u003e\u003ch3\u003eModel and connectivity\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eModel\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003ePST-WSD400H\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eConnection\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003eWi-Fi 2.4GHz, IEEE 802.11 b\/g\/n\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003ePower supply\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003eTwo LR03 AAA batteries, DC3V total; or USB-C DC5V\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eTemperature measurement range\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003e-10 to +60°C\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eHumidity measurement range\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003e0-100%RH\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eTemperature accuracy\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003e±0.5°C\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/section\u003e\u003csection\u003e\u003ch3\u003ePower and operating details\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eHumidity accuracy\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003e±5%\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eOperating humidity\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003e≤90%RH\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eAlarm volume\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003e≤55dB at 1 metre\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eData uploads\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003eEvery 60 minutes by default; adjustable from 10 to 480 minutes\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003cth scope=\"row\"\u003eApp\u003c\/th\u003e\u003ctd\u003e\u003cspan dir=\"ltr\"\u003eSmart Life \/ Tuya Smart\u003c\/span\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/section\u003e\u003c\/section\u003e\u003csection class=\"sd-use\" id=\"pst-wsd400h-en-box\" tabindex=\"-1\"\u003e\u003ch3\u003eIn the box\u003c\/h3\u003e\u003cp\u003eTemperature and humidity sensor, two batteries, two mounting screws, double-sided adhesive and user manual.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"sd-use sd-notice\" id=\"pst-wsd400h-en-usage\" tabindex=\"-1\"\u003e\u003ch3\u003eUsage guidance\u003c\/h3\u003e\u003carticle\u003e\u003ch3\u003eUsing your device\u003c\/h3\u003e\u003cp\u003eUse within the operating humidity limit of ≤90%RH; avoid prolonged operation above it. Cloud history updates every 60 minutes by default, adjustable from 10 to 480 minutes.\u003c\/p\u003e\u003c\/article\u003e\u003c\/section\u003e\u003csection class=\"sd-faq\" id=\"pst-wsd400h-en-faq\" tabindex=\"-1\"\u003e\u003ch3\u003eQuestions to help you choose\u003c\/h3\u003e\u003carticle\u003e\u003ch3\u003eDoes it run on batteries?\u003c\/h3\u003e\u003cp\u003eYes, on two LR03 AAA batteries. It can also run on USB-C DC5V power.\u003c\/p\u003e\u003c\/article\u003e\u003carticle\u003e\u003ch3\u003eCan I change the history update interval?\u003c\/h3\u003e\u003cp\u003eYes. The default is 60 minutes, adjustable from 10 to 480 minutes. Updates are periodic, rather than every second.\u003c\/p\u003e\u003c\/article\u003e\u003carticle\u003e\u003ch3\u003eCan I set alert limits?\u003c\/h3\u003e\u003cp\u003eYes. Set temperature and humidity limits in the app and choose whether the buzzer sounds or stays muted.\u003c\/p\u003e\u003c\/article\u003e\u003carticle\u003e\u003ch3\u003eHow can I use Tuya scenes?\u003c\/h3\u003e\u003cp\u003eLink readings to scenes with other compatible devices. Fans, humidifiers and external controllers are sold separately; the sensor does not supply power to them.\u003c\/p\u003e\u003c\/article\u003e\u003c\/section\u003e\u003c\/article\u003e\u003cstyle\u003e.smfy-catalog-v5{--ink:#20313e;--muted:#586c79;--surface:#fff;--line:#dce7ee;--accent:#65afe5;--notice:#fff9e8;color:var(--ink);background:var(--surface);width:100%;max-width:none;padding:20px 12px;box-sizing:border-box;font-size:16px;line-height:1.8;font-family:inherit;overflow-wrap:anywhere}\n.smfy-catalog-v5 *{box-sizing:border-box}.smfy-catalog-v5 h2,.smfy-catalog-v5 h3,.smfy-catalog-v5 p{color:inherit;margin:0 0 12px}.smfy-catalog-v5 h2,.smfy-catalog-v5 h3{font-weight:500;line-height:1.5}.smfy-catalog-v5 bdi{unicode-bidi:isolate}.smfy-catalog-v5 .sd-intro{text-align:center;padding:24px 0 28px}.smfy-catalog-v5 .sd-intro h2{font-size:clamp(28px,3vw,42px);max-width:850px;margin:0 auto 18px}.smfy-catalog-v5 .sd-intro p{max-width:1000px;margin:0 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