Bluetooth 3.0 version, easy to pair with most Bluetooth-enabled devices Dual speaker units deliver rich highs and shocking bass, giving you a live-sound feeling Large number display, you could easily see the time and set alarm clock Support TF card and Aux-in, you could enjoy music by different ways Built-in microphone, one button to answer or hang up the call, free your hands and enjoy clear phone call Support FM radio function Built-in rechargeable 2000mAh battery Specification: Bluetooth version: 3.0 Battery capacity: 2000mAh Speaker: 3W x 2 + Diaphragm Charging time: 4 hour Charging voltage: 5V 500mA Size: 39.3 x 7.9 x 7.3cm NW: 0.833kg Compatible with: iPhone iPad iPod Samsung, Sony, Xiaomi, Huawei, etc. smartphones and tablets Other Bluetooth-enabled devices 3.0 or audio devices with 3.5mm jack