Oregon Scientific THN132N Wireless Temperature Sensor Type: Weather Monitoring Features: Transmit 100 ft from the main unit. Requires 1 AA battery. Set to one of three channel. Red LED light notifies when data transmission has been sent. A sensor with an water-resistant casing and a battery cover that's easy to slip on and off. Specifications: Temperature Range: -22F to 140F Resolutioin: 0.2F Dimensions & Weight: 3.8 L x 0.9 D x 2.0 H Brand: Oregon Scientific