Note: When the battery life is less than 10%, speaker has a reminder soundWhen the battery life is less than 3%, speaker will turn off automaticallyBroad Compatibility: Compatible with most of Bluetooth-enabled devices. Support TF card(MP3/WAV format) and AUX cable. SpecificationsOutput: 16W+ (Dual 8W Driver & Bass Enhancement) Bass Enhancement: Advanced Streamline Bass PortBluetooth Version: V4.1Bluetooth Connection Range: 33ft / 10 metersBattery: Rechargeable 4500mAh capacityMusic Playtime: 6-12 hours play via BluetoothHands Free Call: Built-in High Sensitive MicInterface: USB interface, TF card, AUX