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C52 - SP Expansion Speakerphone

The Snom C520 - WiMi combined with the Snom C52-SP is the perfect solution for people who regularly hold teleconferences in large rooms or with large numbers of people. Up to three C52-SP units can be paired wirelessly with the Snom C520 - WiMi with ease, then serving as fully hands-free modules thanks to the two integrated microphones and powerful speaker.

The C52-SP can be moved around anywhere in the room at a distance of up to 50 metres enabled by wireless DECT connection and battery operation. Thanks to the fully automated voice synchronisation of all microphones, all attendees can be clearly understood in optimal HD-Voice quality. The C52-SP speaker also features a very powerful battery for up to 12 hours talk time.

The C52-SP can also be wirelessly connected to any Snom desk phone featuring a USB port when connected with the A230 DECT USB stick.

Quick summary

  • Full-duplex hands-free unit
    With Snom HD-Voice, voices are transmitted in crystal-clear quality through the high-quality speaker and integrated microphone.
  • Snom HD-Voice
    Thanks to the G.722 broadband codec, calls can be made in crystal-clear HD-Voice quality.
  • Up to 12 hours talk time
    The integrated battery in the C52-SP enables talk time of up to 12 hours
  • Up to 70 hours standby
    The C52-SP comes with a battery charge of up to 70 hours standby time or can be operated with the power supply unit provided.
  • Wireless integration
    o increase speaker and microphone range significantly, even in larger rooms or conferences involving large numbers of people, up to three C52-SP units can be used simultaneously with a C520 - WiMi conference telephone. The C52-SP hands-free units are wirelessly connected to the C520 – WiMi and can operate at a range of up to 50 metres.
  • Investment security
    With the C52-SP, Snom conference solutions based on the C520 - WiMi can be adapted both to expanding numbers of attendees in teleconferences and to larger-size meeting rooms. The wireless conference solution grows flexibly with your business, as existing equipment and infrastructure do not need to be replaced.

Product video:


  • C520-WiMi expansion unit for large conference rooms

  • Extensive operating range thanks to the DECT technology
  • Flexible positioning thanks to the battery power supply and DECT technology
  • Up to 3 C52-SP can be used at the same time for every C520-WiMi
  • Call handling and volume buttons placed on the C52-SP
  • Multicolour status LEDs



  • DECT coupling via the C520-WiMi
  • No additional equipment required 


  • Dimensions (ca.): 305 x 305 x 61 mm (LxWxH)
  • Weight (ca.): unit 1.1 kg
  • Input voltage: 12V DC (SELV)
  • Power supply: Batteries or 12V DC power adapter  (included)
  • up to 70 hours battery life in stand-by
  • up to 12 hours talk time
  • DECT connectivity (up to 3 for every C520-WiMi)
  • Call handling and volume buttons
  • LED status light (call, mute, etc.)
  • Environmental conditions:
    • Operating temperature: from -5°C to 45°C
    • Non-operating temperature: from -5°C to 60°C
    • Humidity: up to 95% (non-condensing)
  • Included in the package:
    • C52-SP
    • Battery for the C52-SP
    • Cable
    • Quick start guide (QIG)
  • Colour: Black
  • Manufacturer’s warranty: 2 years
  • Product code: 00004357


  • CE Marking

  • IEC 60950 safety


Up to three C52-SP units can be connected to a single C520-WiMi at the same time.

To operate, the C52-SP needs a C520-WiMi and is not compatible with other DECT based devices.(1)

(1) Compatible with C520-WiMi (product code 00004356)