Mini Portable Amplifier Combining In A Compact Unit Microphone Features, Amplifier, Bluetooth Wireless Diffuser, Integrated Rechargeable Battery Overhead Output Power Up to 8 Watt Digital RMSPlayer Can Read Mp3 or WAV files from one TF Micro SDSupport Wireless Audio Streaming Streams via Bluetooth From Smartphone and Integrated Tablet Battery High Capacity Rechargeable Lithium Ion in 3 hours Which guarantees over 15 hours of operation continuously be worn at your choice in different ways (to the belt, shoulder strap, hanging around the neck) Ergonomic design and compactola box contains: 1 E128 amplifier unit, 1 HM Headset-850 with microphone, 1 USB charging cable, 1 Recommended shoulder strap: Teachers, tourist guides, people who have to talk or transmit audio content to medium groups-Small of outdoor people, entertainment