Ooma Telo VoIP Home Phone System (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty DECT radio supports up to 4 wireless handsets and over 4000 sensors. A USB port supports Wi-Fi and Bluetooth accessories and provides future expansion opportunities. Built in speaker provides the ability to screen calls prior to answering. Built-in 900MHz dual-core processor provides the power for Ooma PureVoice including HD Voice and adaptive redundancy for a more natural sounding voice without stuttering or interruption.