The sensor is built-in = if you need to be more precise, please open a new aperture at the position of the sensor to expose the sensor to more indoor environments
( Batteries are not included ) Temperature / humidity error value: 10% Large LCD display, multi-function. HTC-1 Indoor thermometer hygrometer HTC-2 In-outdoor thermometer , Indoor hygrometer Memory of MAX & MIN measuring value. 12 hour / 24 hour displaying system selectable. degree C & F unit selectable. Clock, Date & Calendar function (month and date). Everyday alarm function. Desk-top placing or Wall Hanging. Low power consumption. High stability & accuracy. NO backlight
Device color: White Temperature range: Indoor & Outdoor -50 +70 degree (-58 +158degF) Humidity range: 10% - 99% RH Humidity accuracy: -/+10% RH Power supply: 1.5V*1 (AAA size) Device dimension: 10.5*9.8*2.4cm HTC-2 cable length :1.5meter , There is no sensor for HTC-1
ProductSiteLaunchDate : 2023-02-24T09:33:29.832Z RoomType : Bedroom Size : HTC-1 Style : Modern SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 Voltage : 1.5 volts WebsiteShippingWeight : 0.295 kilograms WirelessCommStandard : bluetooth