Features: Wifi Temp & Humidity Monitor: wireless thermometer and hygrometer, allows you to easily monitor temperature and humidity in real time from anywhere via mobile phone app. Fast & Accurate Measurement: it equips with high sensitivity sensor, precisely measures temp (-10~55) and humidity (0~99%RH), fast shows measurements on LCD display. Convenient Alert Function: in addition to switch unit (/), read line chart, you can preset temp & humidity threshold with app, receive an alarm immediately at the measurements out of range. Easy Placement: you can effortlessly mount this indoor temperature humidity gauge on wall by adhesive pad, also place it on table, desk, etc., very convenient. Wide Range Of Application: this temp humidity smart sensor, helps to grasp environment condition, fast tackle changes, suitable for bedroom, baby room, office, etc. Specifications: Material: ABS + electronic components Color: white Temperature range: -10~55 Humidity range: 0~99%RH Quiescent current: 75uA Alarm current: 60mA Low voltage and undervoltage: 2.2V Power supply: USB power or 2 * 1.5V LR03 battery (not included) Wifi: 802.11b/g/n Alarm sound pressure: 55dB Installation method: wall-mounted Working temperature: -10~60 Working humidity: max 90%RH Item size: 61*61*27mm / 2.40*2.40*1.06in Item weight: 50g / 1.76oz Package size: 6.2*6.2*5cm / 2.44*2.44*1.96in Package weight: 66g / 2.32oz Note: Temp humidity monitor only, others in pictures are not included. Due to manual measurement, there may be deviation. Due to lights or others, it may slightly differ from pictures. Packing List: 1 * Temperature Humidity Monitor 1 * Adhesive Pad 2 * Screw 2 * Plastic Expansion Bolt 1 * Pin 1 * User Manual