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 based on 10 transmissions per day. Power: 6V 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 between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.