1. This is a dual-channel transmitter that can only be activated after entering a suitable combination. 2. The device is designed to be installed in indoor or outdoor locations. Since the transmission code changes with each transmission session, it ensures the highest level of security. 3. The expected transmission range is 200 meters in open space and 35 meters indoors. 4. The battery life of the device is designed to last approximately 2 years with 10 transmissions per day. 5. Power supply: 6 volts DC 6. Two CR2032 lithium batteries 7. Battery life: 2 years (4 operations per day) 8. Frequency: 433.92 MHz ± 75 kHz 9. Transmission power: 1 milliwatt 10. Data format: Standard format 11. Operating temperature: -20 to +55 degrees Celsius 12. Password number: 0 - 8 13. Waterproof rating: IP54 14. Material: Plastic + Metal 15. Color: Black + Gray 16. Package contents: - One keyboard - One English manual 17. Only the above package contents are included, and no other products are provided. 18. 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.