This item is a Cisco Linksys VoIP Phone Adapter SPA2102 model. Function: Enables Voice-over-IP (VoIP) service by connecting analog phones or fax machines to a high-speed internet connection. Ports: Features two independent RJ11 phone jacks for handsets and an Ethernet port for network connectivity. Features: Supports Session Initiation Protocol (SIP) for reliable voice communication. Included: Comes with a power adapter cable for functionality. 4” length 4” width 1” height
eBay