Metal Wireless Keypad Door Opener Keypad Rolling Code 433MHz for Garage Door Access Control. This dual-channel transmitter activates only after entering a valid combination. Designed for indoor or outdoor installation, it ensures high security with a rolling code that changes with each transmission. 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 lithium batteries. Frequency: 433.92MHz +/-75KHz. Transmitter power: 1mW. Data format: standard. Operating temperature: -20°C to +55°C. Password range: 0-8 digits. Waterproof rating: IP54. Material: Plastic and metal. Color: Black and gray. Package includes: 1 x Keypad, 1 x English manual. Product may vary slightly in color due to lighting and display differences. Measurement error allowance: +/-1-3cm.