Dual channel transmitters that are activated only after entering a suitable combination. The units are designed for installation in indoor or outdoor locations, ensuring high security as the transmitted code changes with each transmission session. Estimated transmission range is 200 meters in open space and 35 meters indoors. Designed for long battery life, equivalent to approximately 2 years of operation with 10 transmissions per day. Power: 6 Volt DC 2 x CR2032 Li battery 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 Only the above package content is included; other products are not included. Note: Lighting and different displays may cause slight color variations between the item in the picture and the actual item. Measurement allows an error of +/- 1-3 cm.