TaoTronics&reg; Portable Bluetooth 4.0 Speaker, Micro SD Card Slot, Enhanced Bass Boost, Buit in Mic, USB PC Speaker, 8 Hours Playtime (TT-SK01 Black) Portable Bluetooth wireless speaker with compact bass design streams music with 2 x 3 Watt Speaker that delivers high-fidelity audio especially in low frequency. Stream wireless music from smart phones, tablets, MP3 players, notebooks, handheld gaming consoles and other Bluetooth audio devices up to 10m. Built-in microphone with advanced noise cancellation enables clear wireless Hands-Free calling and conferencing. Allows connection with a non-Bluetooth audio device through micro USB port. Accepts Micro SD cards and plays MP3 files. Powered by rechargeable lithium-ion battery can last up to 8 hours of playback time on a full charge.