No fear bluetooth speaker bluetooth v21 edra2dp speaker bluetooth connect with smartphone ipod touch 3gs etc distance in 10m handfree function with intelligent voice with line in function to connected with mp3 mobile psp ipad etc charging indicater play micro sd card power supplier dc5v output power 3w1khz thd10 frequency 200hz 20khz signal niose ratio 85db li ion output 37v 42v005v li ion input 5v battery capacity 300m