Specification: Item Type: Wireless Microphone_x000D_Material: Metal_x000D_Function: Microphone_x000D_Scope of Application: Suitable for multiple types of equipment such as mixers and power amplifiers._x000D_Microphone Built In Battery: 2 x AA Dry Battery (Not Included)_x000D_6.35 Receiver Built In Battery: 18650 Rechargeable Battery_x000D_Built In Battery Capacity: 1200mAh (Delivered with Supporting Battery)_x000D_Working Frequency: 640-669.5MHz._x000D_Crystal Frequency: 24.576MHz, Crystal Adjustment Range: +/-20ppm_x000D_Occupied Broadband: 300KHz; Transmission Rate 204.8Kbps_x000D_Delay: The delay from microphone input to audio output is less than 3ms (48KHz sampling rate mode, do not use anti howling function)_x000D_Audio Signal to Noise Ratio: 96dB_x000D_Frequency Response: 30~20KHz_x000D_Dedicated Data Channel: 7Kbps, internal CRC check, audio and data use 32-bit encrypted word transmission Features: 1Support 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. 2Fully 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. 3Stage Sound Quality: High quality sound transmission, clear sound, no feedback, no distortion. In the case of obstacles, the transmission range can reach 100 feet. 4Long 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. 5Multi Purpose Application: Perfect choice for karaoke parties, DJs, weddings, churches, business meetings, classroom activities, outdoor or stage performances. PackageList: 2 x Microphone 1 x Charging Cable 1 x 6.35 Receiver 1 x 18650 Battery 2 x Anti Slip Mat