Bluetooth function Support USB,MP3 line in,MIC Lithium battery Portable FunctionSupport USB,MP3 Line in,Buletooth ,Lithium battery SizeL205*H75*D35mmPowerTHD=10% 1K Hz 3W*2Unit 1.5"*2Recharge PowerUSB/DC 5 V/500mARecharge ICITC4054Charge Current400mALithium Battery3.7V/600mABoost ICFP6290AmplifierPAM8403USB master controlAC2090Bluetooth Supplier ISSCBluetooth ICBM81SPK01 Bluetooth min speaker MIC ...