1、Support Multiple Groups to Work Together: The UHF technology in this handheld microphone allows you to use up to 32 groups at the same time, and each group will not interfere with each other when working. 2、Fully Compatible: By inserting a 6.35mm mini receiver into these audio devices, it is widely compatible with PAs with microphone input, mixers, and speakers for voice amplification. 3、Stage Sound Quality: High quality sound transmission, clear sound, no feedback, no distortion. In the case of obstacles, the transmission range can reach 100 feet. 4、Long Working Hours: Plug and play. The AA battery powered microphone and the large capacity rechargeable battery in the mini receiver allow long hours of work. 5、Multi Purpose Application: Perfect choice for karaoke parties, DJs, weddings, churches, business meetings, classroom activities, outdoor or stage performances. 2 x Microphone1 x Charging Cable1 x 6.35 Receiver1 x 18650 Battery2 x Anti Slip Mat Item Type: Wireless MicrophoneMaterial: MetalFunction: MicrophoneScope of Application: Suitable for multiple types of equipment such as mixers and power amplifiers.Microphone Built In Battery: 2 x AA Dry Battery (Not Included) 6.35 Receiver Built In Battery: 18650 Rechargeable BatteryBuilt In Battery Capacity: 1200mAh (Delivered with Supporting Battery)Working Frequency: 640- 669.5MHz.Crystal Frequency: 24.576MHz, Crystal Adjustment Range: +/-20ppmOccupied Broadband: 300KHz; Transmission Rate 204.8KbpsDelay: The delay from microphone input to audio output is less than 3ms (48KHz sampling rate mode, do not use anti howling function)Audio Signal to Noise Ratio: 96dBFrequency Response: 30~20KHzDedicated Data Channel: 7Kbps, internal CRC check, audio and data use 32-bit encrypted word transmission