The Evo True Wireless System brings together the features you need in a revolutionary Patent Pending design. Waterproof, rechargeable, no wires, no bodypack! By miniaturizing the electronics and placing the transmitter comfortably behind the ear, the Evo remains stable and secure. The Evo operates with the easy to use and ultra reliable AnsrAudio Scan16 receiver. With the press of a button, the Scan16 will find a clear channel for you - then, set the Evo to match that channel and you are ready to go! The system will remember these settings even after you turn the components off. After use,simply connect the Evo to its charging cable and walk away - it will be charged and ready when you are.