Key features: 2.4GHZ wireless transmitter and receiver, easy to operate Up to 6 hours of working time on a full battery Works with many applications 6.5mm adapter for versatility of use Both devices can be charged simultaneously Specification: Frequency: 2.4GHZ Frequency response: 20Hz - 20KHz (3dB) Pairing: Automatic Power supply: Rechargeable lithium battery Power Consumption: