Features: and high qualityProvides stable and reliable wireless transmission. Ensures good performance for your every for time.Built-in rechargeable battery,it could use for about 10 hours working for time after fully charged.Compact and lightweight, just make the wireless microphone system sample to use and easy to carry.Widely used in schools, cinemas, restaurants, restaurants, meeting rooms, multimedia rooms, etc.Provides stable and reliable wireless transmission. Specifications:Material:MetalSize:Approx.12x3.5cm/4.72x1.38inColor:Black3.7 V 900mAh BatteryFrequency Range:740-770mHzWorking Current:<120mAWorking Time:About 10 hours Note:Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1 x Transmitter1 x Receiver1 x USB Cable