A. This is a dual-channel transmitter that can be activated after entering a suitable combination. B. The device is designed to be installed in indoor or outdoor locations. As the transmission code changes with each transmission session, it provides a high level of security. C. The expected transmission range is about 200 meters in open space and around 35 meters indoors. D. The battery life of the device is designed to last approximately 2 years with 10 transmissions per day. E. Power supply: 6 volts DC F. Two CR2032 lithium batteries G. Battery life: about 2 years (4 operations per day) H. Frequency: 433.92 MHz ± 75 kHz I. Transmission power: 1 milliwatt J. Data format: Standard format K. Operating temperature: -20 to +55 degrees Celsius L. Password number: 0 - 8 M. Waterproof rating: IP54 N. Material: Plastic + Metal O. Color: Black + Gray P. Package contents: - One keyboard - One English manual Q. Only the above package contents are included, and no other products are provided. R. Note: Light and different displays may cause slight differences between the color of the items in the picture and the actual product. A measurement error of ±1 - 3 cm is allowed.