Features:The receiver for smartphone,camera,computer.Wireless lapel microphones can be used for course teaching,recording,live streaming,conference,vocal,vlog,, etc.Operating range is up to 164 feet and the signal transfer more stable.The transmitter and receiver have built-in rechargeable batteries.The small size and lightweight design can easily carry. Specifications:Operating Range: About 164 feet (50 meters accessibility) Material:ABSColor:BlackWorking Voltage:3.3-5VSensitivity:-382dBSignal Shielding: 90dBFrequency Range:2.4-2.483GHzWorking Current:Max 100mAhUsing Time:About 5HoursCharging Current:400mAhCharging Time:About 2HoursDynamic Range: 90dB 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:1x Transmitter;1x Receiver;1x USB Charging Cable;2 x 3.5mm o Cable;1 x Microphone;1x User Manual;