Bietrun Portable Rechargeable(Work Of 6 Hrs)Loud Bluetooth Pa Speaker With Wired ?UHF 20W Voice Amplifier:The Bietrun voice amplifier adopts UHF transmission, with 20W peak power to output powerful, clear, crisp and no noise distortion sound. ?It covers about 10000 sq.ft (1000 ?), and the stable performance perfect for amplifying your sound and saving your throat. ?Rechargeable and Long Battery life: Personal voice amplifier built-in a 2000mAh rechargeable lithium battery, works 12 hours at max volume and takes only 3H with a full charge.?The wireless microphone can be used for about 6 hours. ?2 in 1 charging cable(Included) charges amplifier and wireless mic simultaneously.?If no input signal is detected within 20 seconds, speaker will enter sleep mode automatically to save power. ?Portbale, Lightweight and Compact: The speaker is a portable public address system.?Weights only 0.45 lb/204g, equipped with a back clip to fix the device at your belt or pocket, or you can hang it around your waist with the included waistband belt. ?You can use this in any setting from indoor to outdoor use, perfect for teachers, coaches, training, presentation, tour guide, classrooms etc. A big help in speaking to 50+ members in your group. ?Bluetoothe Multi-function: Touch the SOURCE button 3 times to switch to bluetooth 5.0(30M) mode, then turns on Bluetooth on the phone, search "Bietrun? and pair it. ?Support TF(Micro SD) card, USB Disk, FM radio, Recording(Only in wired mic mode), 3.5mm AUX audio input and touch display.?You can long press Play/Pause button to repeat single tune or loop all music. ?Please make sure the TF card/USB Disk(Not included) is inserted before recording. ?Wired and wireless Microphone Headset: Easy to Use.?Insert the wired microphone into the MIC jack to use. Or turn on the wireless mic, it will pair automatically within 3S.?The wireless mic owns 60 channel, you can short press the Pair button on the wireless mic to avoid interference.?Two microphone headsets are lightweight and adjustable.You can adjust the distance between the microphone and mouth with its flexible gooseneck.?We offer reliable 1-year warranty.