Portable size, Easy to operate. * Can make your sounds more louder,Can work with MP3, MP4, cell phone, and computer.It has a microphone input and a MP3 input. * High performance-to-price ratio,High quality, good frequency response * Low power consumption. Two lithium batteries, long battery life, up to 8 hours, charging low voltage protection function. * Loudspeaker enclosure is ABS material, case with strap, can be worn at the waist. Suitable for teaching, tour guiding, sales promotion, and speech, etc.