LCD Digital 433MHz Wireless 8-Channel Indoor/Outdoor Thermo-hygrometer with Three Remote Sensors Thermometer Hygrometer Comfort Level Alarm Function Multi-functional LCD thermo-hygrometer brings much convenience for your daily life. With this product, you can know indoor/outdoor temperature and humidity from the indoor receiver easily. Features: Can measure indoor and outdoor temperature and humidity. 433MHz transmitting frequency, you can know outdoor temperature and humidity with indoor receiver. Outdoor(CH 1,2,3) and indoor temperature/humidity HI/LOW alarm. °C / °F temperature unit selectable. Min/Max records of temperature and humidity.  Temperature and humidity manual calibration. Temperature and humidity trends indication.  Comfort level indication. Can receive up to 8 sensors. With dip switch to set up and fix 1-8 channels. Long searching function after communication is lost. Free standing or hanging. Specifications: Display: LCD  Indoor Temperature Measurement: 0~60°C / 32~140°F Outdoor Temperature Measurement: -40~60°C / -40~140°F Temperature Accuracy: ±1°C Humidity Measurement: 10%-99% Humidity Accuracy: ±5%  Transmission Frequency: 433MHz Transmission Range: 100 meters(300 feet) in open area  Transmission Interval: 60 seconds  Remote Sensor Battery: 2 * 1.5V AAA Batteries(NOT included)  Receiver Battery: 4 * 1.5V AAA Batteries(NOT included) IP Grade: IP44 Remote Sensor Size(1pc): 45 * 110 * 21mm / 1.77 * 4.33 * 0.83in  Receiver Size: 115 * 125 * 24mm / 4.53 * 4.92 * 0.94in  Remote Sensor Weight(1pc): 50g / 1.76oz Receiver Weight: 145g / 5.13oz Package Size: 18.2 * 13 * 6.8cm / 7.16 * 5.12 * 2.67in Package Weight: 369g / 13.02oz Note: Please don't soak the outdoor transmitter into the water. Package List: 1 * Indoor Receiver 3 * Remote Sensors 1 * User Manual (English)