Features 1、Good Performance: Built in high sensitivity professional dynamic microphone, stable signal, no radiation, anti interference, distortion &lt;0.2%, transmission distance up to 100m/32.8ft (open place). 2、Stable Frequency: This wireless microphone uses UHF professional automatic frequency technology to provide fast and constant frequency, 700MHz‑800MHz range, plug and play. 3、Rechargeable: Both the microphone and the receiver have a built in 1200mAh rechargeable lithium battery, which can be fully charged in about 3 hours, providing about 6 hours of working time. 4、LED Display: Wireless microphone with LED display, you can clearly see the battery, channel and signal, multi function buttons, easy to use, very suitable for karaoke, performances, interviews, etc. 5、Easy To Use: 6.3mm/0.2in to 3.5mm/0.1in converter for multimedia equipment such as speakers, singing machines, sound amplifiers, for PA systems, voice amplifiers, etc, just plug it into the MIC jack. Specification Item Type: Microphone Material: ABS Model: BG-220U Frequency Range: 700MHz-800MHz Modulation Mode: U Frequency Modulation Frequency Response: 40Hz-15kHz Sound Output: 0-400mV Transmission Distance: Approx. 100m/328ft (Open Place) Receiver Power Supply Voltage: DC 5V The Working Current Of The Receiver: <150mA Microphone Working Current: <130mA Continuous Use Time of Microphone: 6-8 Hours Receiver Battery Type: 1 x 1200mAh 18650 Battery (Included) Microphone Battery Type: 2 x 1200mAh 18650 Battery(Included) (A Single Microphone Needs 1 x 18650 Battery, A Total of Two Microphones) Package List 2 x Microphone 1 x Charging Cable 1 x Receiver 2 x Silicone Non Slip Cover 1 x 3.5mm Adapter 1 x Manual