Dual channel transmitter activated by entering a suitable combination. Designed for indoor or outdoor installation, providing high security with 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. Powered by 6V DC, using 2 x CR2032 lithium batteries. Operating frequency: 433.92MHz +/-75KHz. Transmitter power: 1mW. Data format: standard. Operating temperature: -20°C to +55°C. Waterproof rating: IP54. Password digits: 0-8. Housing material: plastic and metal. Color: black and gray. Package includes: 1 x Keypad, 1 x English manual. Product dimensions may vary slightly due to manufacturing tolerances. Actual product color may differ slightly from image due to lighting and display settings. Measurement tolerance: +/- 1-3 cm.