This is a dual-channel transmitter activated only after entering the correct combination. The units are designed for indoor or outdoor installation and provide enhanced security, as the transmitted code changes with each transmission. The estimated transmission range is 200 meters in open space and 35 meters indoors. Battery life is estimated at 2 years with 10 transmissions per day. Power: 6V DC Batteries: 2 x CR2032 lithium batteries Frequency: 433.92 MHz ±75 kHz Transmitter power: 1 mW Data format: Standard Operating temperature: -20°C to +55°C Password length: 0–8 digits Water resistance rating: IP54 Material: Plastic + Metal Color: Black + Gray Package Contents: 1 x Keypad 1 x English Manual Note: Due to lighting and display differences, the item’s color may vary slightly from the image. Measurement tolerance is ±1–3 cm.