Description: Product parameters: Indoor temperature range: -4F - 158F (-20C - 70C) Outdoor temperature range: -40F - 158F (-40C-70C) Humidity range: 20%-95% Temperature display unit: C/F optional (default is C) Temperature Resolution: 0.1C/F Humidity Resolution: 1% Refresh rate: 10 seconds. Error: temperature plus or minus 1 humidity plus or minus 5% Wireless reception range: 100 meters RF Radio Frequency: 433 MHz Function: time function, 1 set of alarm clock, snooze function, backlight function (backlight duration 30 seconds) Indoor unit: 3 AA batteries (battery not included) Transmitter: 2 AA batteries (battery not included) Host size: 95*26*112MM Transmitter size: 53*25*112MM Host display size: 4 inches Host net weight: 142g Transmitter net weight: 55g One-to-one packaging details: Single set of product packaging size: 155*33*135MM Single set of product packaging weight: 245g One-to-three packaging details: Single set of product packaging size: 13.5*6*13.5CM Single set of product packaging weight: 367g Specifications: Product Features: 1. Measure indoor and outdoor temperature and humidity, convert Celsius and Fahrenheit 2. Maximum and minimum temperature and humidity memory function 3. View historical temperature and humidity data 4. Up to 3 outdoor units can be connected (with one transmitter, choose one-to-one order, with three transmitters, choose one-to-three to order) 5. Two high magnetic magnets on the back shell of the main unit, which can be adsorbed on metal objects 6. There is a bracket on the back of the host, which can stand in a horizontal position 7. High sensitivity touch button control, easy to operate 8. Time, alarm clock, snooze function 9. Temperature and humidity trend indication 10. HTN large-screen high-definition color LCD display without viewing angle 11. With backlight, the backlight will automatically turn off after 30 seconds without operation 12. The outdoor unit can be hung by hanging holes or placed on the desktop 13. The outdoor unit is XP4 waterproof (in order to keep the outdoor unit in good use, the outdoor unit should be placed vertically to avoid direct sunlight and direct rain for a long time) Package Included: 1 * Main Weather Station 1 * Wireless Transmitter 1 * Manual 1 * USB Cable or 1 * Main Weather Station 3 * Wireless Transmitter 1 * Manual 1 * USB Cable