When paired with the Ebelong controller, the D4 door sensor automatically turns on the light when the door is opened and turns it off when the door is closed.
Enhanced Smart Home Integration
Pair it with the Ebelong smart doorbell gateway for enhanced home automation applications.

Harvesting directly its energy from your push, the Door and Window Sensor doesn’t need any battery (and any wire) to operate
Advantages of a wireless system (flexibility) without the disadvantages (no battery = no maintenance)
This Door and Window Sensor can be mounted concealed in the door frame, it also can be mounted externally on the surface of door and being fixed with screws
Mount it, and forget it
Examples Of Use Cases
D4 Series | Wireless self-powered door and window sensor
| Product Model | D4 |
| Power supply | Self-powered |
| Communication frequency | RF 433M |
| Modulation | FSK |
| Letter of agreement | Ebelong1.1 |
| Communication distance | 80m (outdoor) 25m (indoor) |
| Service life | ≥100000 times |
| Operating temperature | -20℃ ~ +55℃ |
| Shell material | PC |
| Installation method | Double-sided adhesive paste installation |