MULTI-FUNCTIONAL -- Personal voice amplifier can be used as a portable speaker. It has a built-in Bluetooth 5.0 with a working range up to 33ft. Easy connection to Bluetooth, AUX, TF/USB input. It can record audio as streamed through the microphone with USB/TF card inserted. PLEASE REST ASSURED TO BUY - We provide lifetime technical support for HaoWorks voice amplifiers. Please feel free to let us know if you have any questions. We will work hard to provide you with a satisfactory solution. LONG BATTERY LIFE-- Personal voice amplifier lasts a long time (10~12 hours); WIRELESS headset microphone lasts 3~5 hours. The equipped 2 in 1 multiple USB cable and 5V charger make charging very convenient. Only needs 3~5 hours to fully charge them. ULTRA-LIGHT & COMPACT DESIGN -- S278 UHF is a mini voice amplifier with headset microphone which is only 4.5 * 3.5 * 1.3 inches and 0.44 lbs. The voice amplifier includes adjustable waist/neck band for hands-free portability.It is a great aid for anyone who needs to talk all day long, especially teachers,instructors who need their voice for their profession. Portable microphone and speaker set is ideal for teaching, presentations, trainings and public speeches. COMES WITH 2 MICROPHONES -- S278UHF is a personal voice amplifier that comes with wireless & wired headset microphone. Easy set up and the headset is comfortable. Moreover, the wireless microphone is a headset and handheld 2 in 1 design, so you can easily change the headset mode to handheld mode to meet your needs. Hands-free microphone speaker system with low interference and high signal stability, no static, no drop out with use at a distance of 15~65 feet. AMPLIFY YOUR VOICE WITH CLARITY -- S278UHF professional portable voice amplifier allows your voice to be heard in every corner! Mini speaker produces 15 watts of loud clear and undistorted sound that can cover about 10000 sq.ft (1000 ?). Portable microphone helps you to speak with a lower voice, saving your vocal cords unnecessary stress. Megaphone speaker is so easy to use, the tone is incredible, volume control can be easily adjusted to fit the room and function needs.