skip to Main Content


Heng Yu is a Hong Kong based company, with a strong R&D center in our Hong Kong headquarter and powered by our own modern production campus in Zhuhai (Guangdong, China). The two offices are linked up together by the world’s largest and amazing bridge over the sea.

Get In Touch

Phone: +852 2394 1852
Address: Room 1503-05, NanFung Commercial Center, 19 Lam Lok Street, Kowloon Bay, HK

Our Location

852-2394 1852

Call Bell


Technical Data

Call Bell

  • With 1 large emergency button and 4 cap sense buttons
  • With 1 extension cable for emergency button
  • With 4 indication LEDs
  • Wireless: RF 2.4GHz frequency band transceiver with internal antenna
  • Power: 4 rechargeable AAA batteries or 12V/DC power supply
  • The 4 rechargeable AAA batteries can be charged directly by 12V/DC power supply

Dongle (for Receiver Box)

  • USB interface
  • Input Voltage Range: 5V/DC +/-10%
  • Use standard USB HID driver for the keyboard driver
  • Wireless: RF 2.4GHz frequency band transceiver with internal antenna

Receiver Box

  • An advanced signage box where it is powered by embedded Linux OS
  • With TCP/IP socket communication to communicate with the host
  • With USB port for the Dongle

Wireless Specifications

  • 2.4GHz frequency band
  • FSK modulation
  • FCC and CE compliant
  • RF output power: 18dBm
  • Receiver sensitivity: -120dBm
  • Up to 50 meters range


  • Storage temperature: -40°C to +70°C
  • Operating temperature: 0°C to +70°C
  • Operating humidity: 100%
Back To Top