Features: brand new and high quality Provides 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. Provides stable and reliable wireless transmission. Widely used in schools, cinemas, restaurants, restaurants, meeting rooms, multimedia rooms, etc. Specifications: Material:Metal Size:Approx.115x40mm/4.53x1.57in Color:Black 3.7 V Lithium Battery Frequency Range:600-937MHz Audio Frequency Response:80Hz-15KHz Senstivity:-94dBm About 50 meters effective receiving distance. Package Includes: 1 x Transmitter 1x Receiver 1x Carry Bag 1x Manual 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.