Durable metal body & grille; Up to 20 unique selectable frequencies; FCC approved: 902MHz-928MHz UHF; Powerful UHF transmission & reception without interference; 16-bit Digital Pilot ID for fast & accurate pairing; Effective range: 150ft; Lightweight, portable & convenient to use; Compatible with almost any karaoke, PA system, amps or audio Hi-Fi system; Transmitter (microphone) requires 2 AA batteries; Receiver has built-in Li-Ion rechargeable battery cell; Includes transmitter, receiver & charging cable;