Specifications

Product information

• DECT handset M55|Charging cradle
  Colour: black
  Anti-bacterial housing
• Placement: indoor, desktop

Dimensions

• Dimensions (L x W x D, approx.)
• 188 mm × 55 mm × 35 mm
• Weight (approx.)
• Handset & Battery & belt clip: 188 g

Display and indicators

• Display
• TFT liquid crystal display (LCD), highcolour, backlit
  Size (diagonal): 2.4″ (61 mm)
• Resolution: 240 × 320 pixel
• 9 LED indicators
• Notification of missed calls|Message waiting indication (MWI): 1 red LED
  Function key status indication: 6 dual-colour LEDs (red / green)
  Audio key status indication: 1 red LED
  Charging indication: 1 red LED on the charging cradle

Indicators and keys

• 31 hard keys in total
• 12 keys (standard ITU telephone keypad), backlit
  5-way navigation key
• 3 context-sensitive function keys
• 6 programmable function keys (with dual-colour LED)
  3 dedicated audio keys
• Speakerphone (with red LED)
  Volume + / – (rocker)
  2 dedicated function keys
• Offhook
• Multicast paging
  Keyboard lock

Audio codecs and features

• Handset
• Hearing aid compatible (HAC)
  Speakerphone mode
• Headset connectivity

Interfaces and connections

• Power options
• Handset
• Battery 3.7 V, 1,500 mAh, 5.55 W, lithium-ion, rechargeable, up to 240 h standby time, up to 19 h narrowband talk time, up to 12 h wideband talk time
  Charging cradle
• Power adapter: 100 – 240 V AC / 50 – 60 Hz / 300 mA | 5 V DC / 2 A
  USB powering via USB-A port/cable
  Wired interfaces
• Headset: 3.5 mm miniature audio jack
  Wireless interfaces
• DECT3
• Headset (Bluetooth): Bluetooth

DECT technology and features

• Standard: DECT3
• Authentication/encryption of base and handset
  Seamless handover
• Wideband audio
  Frequency band
• Europe: 1,880 – 1,900 MHz
  Americas 1,920 – 1,930 MHz
  Output power
• Europe: < 250 mW
  Americas: < 100 mW
  Coverage
• Up to 50 m indoor range
• Up to 300 m outdoor range
  Related features
• Software upgrade over the air (SUOTA)
• Auto registration when not registered
• Date and time synchronization from base station

User interfaces and setup

• Configuration and setup via menu-driven phone user interface (PUI)
  Languages: English, French, Italian, Spanish, German, Dutch, Greek, Russian
  Localization
• Time zone, dial tone

Networking technologies and protocols

• Bluetooth
  Headset Profile (HSP)
• Wireless range (approx.): 10 m

Directory support and call features

• Directory support
• Local directory with up to 200 entries
  LDAP (server-based directory)1
  Central directory on the base station with up to 500 shared entries1
• XML phonebook support1
  Outgoing call features
• Speed dialling
• Redial (via dialed calls list)
  Caller identification (CLIP)
  Intercom1
  Multicast paging1
  Incoming call features
• Call waiting/swapping
  Auto answer
  Call diversion
  Connected call features
• Hold
  Blind call transfer
  Attended call transfer
  2+1 local conferencing
• Call barging1
• Call park / unpark1
  Related features
• Call history lists
  Shared Call Emulation2
• Extension monitoring (Busy lamp field), call pickup1
  Paging zones1
• Intercom groups1

Environmental conditions

• Operating ambient temperature
• 0 °C – +40 °C

Package contents

• Hardware
• DECT handset M55
• Battery
• Charging cradle
• Power adapter
• Documentation
• Quick Installation Guide

Snom accessories and compatible devices

• Base station M500
  EU & UK: PN 00004628
  Americas: PN 00004524
  Power adapter
• EU: M55 PSU (PN 00004635)
  UK: M55 PSU (PN 00004636)