Dual channel transmitter that activates only after entering a suitable combination. Designed for indoor or outdoor installation, providing high security through rolling code technology that changes the transmitted code with each use. Estimated transmission range is 200 meters in open space and 35 meters indoors. Battery life is approximately 2 years based on 10 transmissions per day. Power: 6V DC, 2 x CR2032 Li battery Battery life: 2 years (4 operations per day) Frequency: 433.92 MHz +/- 75 KHz Transmitter power: 1 mW Data format: Standard Operating temperature: -20C to +55C 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 color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.