Supports phone, laptop, tablet PC and other Bluetooth devices. Equipped with TF (Micro SD) card for built-in MP3 Player. Modular buddy-jack design helps to connect a row of mini speakers to get incredible audio effects. Expanded BXS (Bass Expansion System) drives a fuller, richer low-end response. New, larger 45mm driver delivers precise highs for super sound. Able to connect with USB to 3.5mm plug to any standard portable audio device or player. Supports hands free Bluetooth with incoming call and number announcement. Built in microphone for incoming calls and rechargeable battery.It is long lasting when well maintained. It works perfectly well when charged. Order for this S10U speakers from Jamboshop and have them delivered to your doorstep.