Features: Support?Bluetooth/Line?in?Audio?connection，?FM?radio，?TF?card，?Hards-free?calling Support?L2CAP/A2DP(AVCTP/AVDTP/AVRCP)，?HSP/HFP Voice?guidance Built-in?mic Built-in?Rechargeable?and?Detachable?li-ion?Battery 4?Keys?operation: 1).Mode?key(switch?to?bluetooth/USB/TF?card/FM?radio/Line?in?Audio) 2).Last?song/turn?down?volume?when?press?long 3).Next?song/turn?up?volume?when?press?long 4).Make?a?call?in?phone，?the?pause/play?press?twice?to?switch?the?call?to?speaker. Press?once?to?answer?a?call.?Press?long?to?cancel?pairing?under?Bluetooth?mode. Press?short?to?search?station?under?FM?radio?mode. Specifications: There?are?four?colors?available?for?you?to?choose. Color:?Blue?Red?Yellow?Black Voltage:?DC?5V Dimension:?108?*?36?*?54?mm Bluetooth?Version:?2.1?+?EDR Working?Distance:?up?to?10m Loudspeaker:?4Ω3W S/N?Ratio:?>=?95db Frequency:?280Hz?-?16KHz Built-in?Battery Li-ion?Battery:?BL-5C Voltage:?3.7V Current:?1020mAh Power:?3.8Wh Battery?Carge?Time:?2hrs Package?listing: 1?*?Mini?Wireless?Bluetooth?Speaker 1?*?2?in?1?micro?USB?and?3.5mm?audio?cable