Syn Sons: ��Bluetooth Version:V4.2 , ��Loudspeaker Output:5W , ��Working Range:In 10Metres , ��Gross Weight:512G *-* Battery Voltage/Capacity:1200Mah , ��Battery Charging Voltage:5V /500Mah , ��Play Time Values For Speakers :3-4Hours *-* Built-In Microphone For Hands-Free Calling Function Enables Users To Answer An Incoming Call Without Delay *-* Compact & Metal Enclosure] About The Size Of A Ring Box, This Speaker Fits Into Pretty Much Any Pocket Or Bag�?your Jacket Pocket Or The Small Side Pocket Of Your Backpack So You Can Take Your Sound Literally Anywhere You Want.