4D-B Professional 4 Channel UHF Wireless Handheld Microphone System 4 Microphones 1 Wireless Receiver 6.35mm Audio Cable LCD Display for Karaoke Family Party Presentation Performance Public Address 4 channel UHF wireless handheld microphone system. High sensitivity, super clear sound, great anti-interference capability. Perfect for stages, ballrooms Karaoke, families party, meeting, as well as for giving a speech, presentation, public address. Features: Professional 4 channel UHF wireless handheld microphone system, stylish and compact design.  frequency range, high sensitivity, super clear sound, great anti-interference capability. Effective working range up to 80 meters in open-area. Standard XLR balanced and 1/4" mixed output interface. Independent volume adjusting knobs for 4 channels, with AF/RF indicator light. One mic run on 2 * AA batteries(not included), and the receiver powered by power adapter. Comes with a 1/4" audio cable. Perfect for stages, ballrooms Karaoke, families party, meeting, as well as for giving a speech, presentation, public address. Specifications: Model: 4D-B --Receiver: Frequency Response: 60Hz-16KHz Signal-to-noise Ratio: > 103dB Working Range: 80meters(in the open area) Power Supply: AC Adapter(100-240V) Plug: EU Receiver Size: 42 * 21 * 4.5cm / 16.5 * 8.3 * 1.8in Receiver Weight: 1748g / 61.6oz --Microphone: High Frequency Output: 30mW(Max.) Power Supply(Single): 2 * AA Batteries(not included) Microphone Size(Single): 26 * 5 * 5cm / 10.2 * 2 * 2in Microphone Weight(Single): 327g / 11.5oz Package List: 1 * Receiver 4 * Wireless Microphone 1 * Charger 1 * 6.35mm Audio Cable 4 * Anti-Slip Sleeve 2 * Antenna 1 * Manual Note: The batteries are not included.