Alarm Contact Sensor: The operating wireless range is 600ft in OPEN area with LED indicator,ideal door sensor chime for office/home/store.
Loud Sound: 52 different ringtones with 4 sound level from 25~110dB to adjust, perfect for your daily use(INDOOR use only).
Easy Intallation: Pls install it AFTER pairing.Plug the receiver into socket,tear off the tape behind door sensor then paste on the door.
Expandable: Each door sensor or receiver can be expandable,you can use them with additional BITIWEND door sensors or doorbells.
1 year quality warranty: Any problems about door open chime,pls contact with our customer service team to get a full refund or replacement.