Dual channel transmitters that are activated only after entering a suitable combination. 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 battery life equivalent to approximately 2 years of operation with 10 transmissions per day. Power: 6V 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 items listed above are included; other products are not included. Note: Lighting and different display settings may cause slight color variations between the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.