Features:* Support Bluetooth/Line in audio connection， FM radio， TF card， hards-free calling* Support OPP，OBEX，SPP，A2DP，AVRCP，FIP，HS/HF，DUN，PROFILES* Voice guidance* 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 Bluetooth Version: 2.1 + EDR Working Distance: up to 10m Loudspeaker: 4Ω3W S/N Ratio: 75db Frequence:120HZ-18KHZCurrent: 600mAh Package listing: 1 * Mini X3 Wireless Bluetooth Speaker 1 * USB Cable