- Plastic
- Doorbells: large range of induction – up to 100 meters detection range.
- Motion sensor detector alarm: receiver host: 2*aa battery(not included), saving design so that its battery have long lifetime
- Security alarm: classic songs can be choose – classic and great music makes people happy.
- Doorbell: support welcome/doorbell/alarm mode – welcome mode applicable to business services, doorbell mode uitable for family courtyard and door, alarm mode use as burglar alarm system.
