Dual channel transmitter that activates only after entering the correct combination. Designed for indoor or outdoor installation, providing high security with a rolling code system that changes the transmitted code with each use. Estimated transmission range is up to 200 meters in open space and 35 meters indoors. Battery life is estimated at 2 years based on 10 transmissions per day. Power: 6V DC, 2 x CR2032 lithium batteries Battery life: 2 years (based on 4 operations per day) Frequency: 433.92 MHz 75 kHz Transmitter power: 1 mW Data format: Standard Operating temperature: -20C to +55C Password digits: 08 Waterproof rating: IP54 Material: Plastic and metal Color: Black and gray Package Contents: 1 x Keypad 1 x English Manual Note: The package includes only the items listed above. Other products are not included. Lighting and display differences may cause slight color variations between the product image and actual item. Measurement error allowance is +/- 13 cm.