iCozzier&trade; Portable Rechargeable Tiny Design Wireless Bluetooth Speaker with Multi-purpose Power Button, Amazing Sound,Mic For Calls - Silver You can experience a high definition tunes through a 3W driver- outclassing other similar-sized portable speakers. It weighs only 2.7 Ounces. Built-in bass diaphragm, create the perfect bass effect, lower distortion. Compatible with almost all Bluetooth-enabled devices (2.1 and over). 3.5mm audio port for non-Bluetooth devices. Bluetooth transmission range: 8~10 m (with no obstructions), built-in microphone with a 2-feet pickup range allows the speaker to double as a speaker phone. Built-in rechargeable lithium battery, offers 5.5 hours of playtime via 3.5mm audio port and 3.5 hours of playtime via Bluetooth connection, and is charged via USB Cable(charging cable included) A multi-functional button can be achieved: on / off, pause / play, pick / reject / re-dial telephone. Frequency Response: 20Hz-20KHz. Speaker Dimensions: 49mm x 43 mm x 43mm.