Connection method: wireless Radio transmission distance: 30-100m (Open area) Scope of application: garage door, alarm, automatic door, rolling door, etc. Suitable for 99% of remote controllers on the market. Specifications: 1. Working voltage: DC6V 2. Working current: 9-12mA 3. Operating frequency: 433MHz 4. Transmitting power: 10-15mW 5. Launch distance: 80m (open) 6. Frequency deviation: ±0.2MHz 7. Encoding chip: EV1527 (learning code) 8. Oscillation resistance: 330K 9. Number of keys: 4 keys 10. Modulation method: ASK 11. Quiescent current: 0uA 12. Volume: (L'W'H) 63mm x 35mm x 13mm Colour:black+white Material:ABS Package Contents: 3 x remote control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.