1. Material: ABS 2. Voltage: 110-240V 3. Volume: 8 levels 4. Distance: 180 meters 5. Power: 0.5W 6. Working frequency: 433MHz 7. Support one-to-one signal pairing, long-distance transmission, signal coverage without dead angles 8. 29mm large speaker, easily heard within 300 square meters 9. The buttons can be directly pasted, easy to install, plug and play
