Door Release Button

Wired doorbell

Model NO:HSY-D90

Wired doorbell

Wireless doorbell

Model NO:HSY-D91

Wireless doorbell

Port Powered RS-232 to RS-485 Interface Converter

Model NO:HSY-RS232

RS-232C data interface fully compatible with PC

Wireless Remote control Button

Model NO:HSY-K10

1. Contact Output: NO / NC / COM 2. Transmitting Frequency: 433.92MHZ 3. Transmitting Distance; ≥50m(in the open a..