The Dual SP-2EVO-25-D1 Wireless system includes 2 EVO headset mics, a 16 channel Auto Scan receiver, battery charger, and all mounting hardware. Totally redesigned electronics offering improved audio frequency response and reliability. The Evo™ True Wireless System brings together the features you need in a revolutionary PatentPending design. Waterproof, recharging, no wires, no bodypack! By miniaturizing the electronics and placing the transmittercomfortably 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 it's charging cable and walk away - it will be charged and ready when you are.