This is a dual-channel transmitter activated only after entering a valid combination. The units are designed for installation in indoor or outdoor locations and provide high security, as the transmitted code changes with each transmission. The estimated transmission range is 200 m in open space and 35 m indoors. Battery life is estimated at 2 years with 10 transmissions per day. Power: 6V DC Batteries: 2 × 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 × Keypad 1 × English Manual Note: Due to lighting and display differences, the item’s color may vary slightly from the image. Measurement tolerance: ±1–3 cm.