Speaker functions: support bluetooth function, with fm radio, calling support tf card playing, support line in. Product specifications : bluetooth :v2.1, working distance : up to 10m, voltage : dc 5v, battery charge time : 2hbattery : 3.7v/800mah, battery type: li-ion battery, loudspeaker : 4 ? 3w, s/n ratio : ?95db, frequency response : 280hz-16khz, power : rechargeable battery, comfortable button design to control volume+/-, pre/next, play/ pause/call pick and mode switch, compatibility:cell phones, laptop pcs, tablet pcs and other bluetooth enabled devices. Mini buetooth x3 portable speaker support moblie phone answer calling and tf card.