This is a dual channel transmitter that is activated only after entering a suitable combination. The units are designed for installation in indoor or outdoor locations, ensuring high security as the transmitted code changes with each transmission session. The estimated transmission range is 200 meters in open space and 35 meters indoors. The unit is designed for battery life equivalent to approximately 2 years of operation with 10 transmissions per day. Power: 6 Volt DC. Requires 2 x CR2032 Li batteries (included). Battery life: up to 2 years with 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 includes: 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 may vary by +/- 1-3 cm.