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 units are designed to ensure a battery life of approximately 2 years, based on 10 transmissions per day. Power: 6 Volt DC 2 x CR2032 Li batteries 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 Only the above package content, other products are not included. Note: Lighting and display differences may cause slight variations in color between the item and the image. Measurement may vary by +/- 1-3 cm.