Product Features: 1.Ultra Portability: Loop a lanyard or keychain around the metal bar and bring it everywhere you go2.Impressive Playback Time: Up to 4 hours of playback with easy Micro-USB charging3.Wireless Connection: Connect to your Smartphone through Bluetooth via NFC4.Dongle Function: Control your playlist via Bluetooth just by plugging the X-mini WE into your other wired audio devices With NFC function, more convenientSpecificationBluetooth Version: V4.0Bluetooth Profile: A2DPOperating Range: Up to 33 feetSpeaker Specifications: 31MMLoudspeaker Power: 3.6 1.5WSignal to Noise Ratio (SNR): 80dbDistortion: 0.3%Operating Frequency Range: 2.4GHz - 2.48GHzFrequency Response: 200 Hz - 20 kHzBattery Charging Voltage: 5V (USB)Battery Charging Time: Minimum of 1.5 hoursBattery: 230mAhPlayback: Up to 6 hour(s)Bluetooth Playback: Up to 4 hour(s)Size: 45 x 45 x 50 mmNet Weight: 48 gPacking size: 80*72*90MMPackaging List:1* Bluetooth Speaker 1* USB Charging Cable 1* Hand Rope 1* User ManualProducts from NIUNIU's store