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Description:Function of main unit: 1) Receives signal of three sensor units, and displays them on screen in distance of about 30m in open field 2) Measures indoor temperature and humidity 3) Measure range: -10 -60oC, 14 – 140oF, 20%RH - 80% RH 4) Accuracy: +/-1C, +/-2F, +/-5%RH; 5) Displays date, time and time alarm 6) Max. / min. indoor temperature and humidity memory 7) Back light 8) Weather prediction 9) Celsius and Fahrenheit switch Parameter of main unit: 1) Size of product: 142 x 80 x 31mm 2) Screen size: 53 x 44mm 3) Eight keys: ADD, CODE, C/F, max. / min., SUB/CLR, alarm, clock, light 4) Uses three LR6 AM3 AA / 1.5V alkaline batteries 5) Light color: green Function of accessory unit (sensor): 1) They can send the signal to the main unit 2) Outdoor temperature measuring: a) Measure range: -20 – 70oC, -4 – 148oF b) Accuracy: ±1C, ±2F 3) Max. / min. indoor temperature memory 4) Celsius and Fahrenheit switch 5) Waterproof 6) It can be hanged on the wall or put on the table Parameter of accessory unit (sensor): 1) Size of product: 95 x 62 x 23mm 2) Screen size: 25 x 12mm 3) Three keys: CODE, C/F, max. / min. 4) Uses two LR03 AM4 AAA / 1.5V alkaline batteries