UEB Portable Bluetooth Stereo Speaker with Built-in Microphone, FM, Handsfree Call Function, Support TF Card Playing for iphone4/4s/5/6/6s and Other Bluetooth Smartphone, Tablet etc. Red Handsfree Function: with built-in microphone, support music play and handsfree call via bluetooth Compatible Devices: support ipadipad2ipad miniiphone4/4s/5/6/6s, Samsung, HTC, Sony, Nokia etc. cellphone and all kinds of bluetooth computer Modular buddy-jack'design: connect a row of mini speakers to get jawdraopping audio performance Expanded bxs (Bass Expansion system) drives a fuller, richer low-end response; new, larger 45mm driver delivers precise high for superb sound Power: powered by rechargeable lithium battery