Dual channel transmitters that are activated only after entering a suitable combination. Designed for installation in indoor or outdoor locations, providing high security as the transmitted code changes with each transmission session. Estimated transmission range is 200 meters in open space and 35 meters indoors. Battery life is estimated to last up to 2 years based on 10 transmissions per day. Power: 6 Volt DC 2 x CR2032 Li batteries Battery life: 2 years (based on 4 operations per day) Frequency: 433.92 MHz +/- 75 KHz Transmitter power: 1 mW Data format: standard Operating temperature: -20°C to +55°C Password number: 0-8 Waterproof rating: IP54 Material: Plastic + Metal Color: Black + Gray Package Contents: 1 x Keypad 1 x English Manual Note: Light and display differences may cause slight variations in color between the product image and the actual item. Measurement allows an error of +/- 1-3 cm.