icoox Stereo Wireless Metal Music Speaker - Bluetooth 4.1 Speaker, Amazing bass Mini-sized Portable Speaker(new Generation, premium Aluminum body), Long playing time 10+ hours (Black) Premium Aluminum body with anodized finishing for different color options(Black/Silver/Gold); CSR4.1 Bluetooth technology and Neodymium speaker units built-in for music fans; Amazing surrounded and stereo sound with awesome bass like JBL, BOSE soundlink mini; Long life span Li-ion battery(2200mAh) for Long playing time 10+ hours; Calls sound quality is stable and pure with electronic noise reduction technology;