Specification:Input voltage: DC5V-500mAhWorking distance:10mCharge time: 2.5-3.5 HoursCharging interface: Micro-USBPlayback time: up to 6HoursBattery: 3.7V 1800mAh lithium BatteryPower: 3WSpeaker: Double speakers 4��3WFM Frequency range: 87.5-108MHzFrequency response: 100Hz-16KHzBluetooth version: 4.0Features:- Bluetooth audio sound， perfect sound quality and effect- 10M bluetooth transmission distance- Charging 2-3 hours， Playing 6 hours- MODE key (switch to FM radio/AUX IN/TF card/ USB) Switch of Lamplight Mode- Last song/turn down volum when press longer- Next song /turn up volum when press longer- Can ring up a call to answer a call - On-Off- TF Card- USB- AUX IN/Micro USBPackage included:1x USB cable1x Bluetooth speaker