Portable Wireless Speaker Hoco BS31 Bright Sound Green with MicroSD Card and AUX Input socket, with v4.2 version and class A polymer lithium 500mAh battery, for 3 hours of talk and music, DC5V charging voltage and charging time of about 2 hours. 53mm speaker. Supports A2DP, AVRCP, HFP and HSP protocols. Dimensions 86x86x44mm and weight 140g