1. No wiring, easy to install
2. Wireless (433MHz)，315MHz
3. Flash alarm indicator (red)
4. Low battery signal
5. Loud 80dB alarm signal
6. Test button for easy recommended monthly testing
7. Intelligent Control of Single Chip Microcomputer，Smoke sensitive
8. Automatic inspection,under-voltage prompt (Ringing every 58 seconds)
9. Unique transmission agreement,strong anti-interference
10. A battery effectively work more than 2 years
11. Transmission power is big, can be used with the fire alarm control panel