Rechargeable UHF Handheld Wireless Microphone with Mini Bluetooth Receiver Support Battery Features: 1. High-performance audio dedicated A/D and D/A processing with 24Bit/48KHz. 2. With automatic mute and impact elimination circuit to avoid the impact and noise of the switch on/off. 3. The effective distance of wireless transmission is 20-50 meters. 4. Multiple devices can be used at the same time, without interference and frequency. 5. With power and wireless indicator light. 6. Extremely high pickup sensitivity and excellent sound quality make your speech or singing easy. 7. Receive two-channel (stereo) output for a variety of audio amplification devices. 8. UHF frequency band is selected, the transmission distance is stable and the anti-interference ability is strong. 9. The transmitter has a frequency modulation function, which can meet the multi-frequency point simultaneous use. 10. The receiver has a charging function and is equipped with a detachable large capacity lithium battery. Specifications: Type: Wireless Rechargeable Size: Approx. 25.5*5.5*5.5cm/10.04*2.17*2.17inch Frequency range: 600mhz-700mhz Frequency response: 50hz-18khz Microphone battery: AA battery (not included) Capacity: 950mah Receiver battery: lithium battery 18650 (not included) Battery capacity: 1200mah Working time:  10 to 12 hours Output power: 5V Package List: 1 * Microphone (No Battery) 1 * Receiver 1 * USB Cable 1 * Adapter Head 1 * Microphone Cover 1 * Microphone Cotton Note: 1. The power supply voltage must not exceed the supply voltage range of this module. 2. Do not touch the components on the back of the module during work, so as not to affect the normal operation of the module or cause the short circuit to burn the module. 3. Check the user manual for detailed use.