For Sale: A used Ooma Telo, with AC adapter, Ethernet cable, and a phone cable. Gently used and in excellent condition. Enjoy free phone service with a host of features like voicemail, caller id, call-waiting, etc. See http://www.ooma.com/telo/ for details.

A new unit costs $90 or up (https://www.amazon.com/dp/B00I4XMEYA), but you can have it for less than half the price.