Features : Wireless Bluetooth speaker, hands-free calling function, compact, easy to carry.Exquisite appearance, concise fashion, transparent and oil-filled outer shell, unique style, showing personality.Supports two ways to play: Mobile Bluetooth / Line In audio input.Professional bass design, super good sound quality. Enjoy music at any time to bring you a good mood.Concise appearance, exquisite workmanship, excellent sound quality, easy to carry out, is the best partner for music lovers. 1. Mini and portable, have basic function: Vol +, Vol -; Play, Pause; HS-Phone, ON/OFF;2. Patent original design, acrylic shell and exquisite workmanship.3. Bluetooth wireless technology, play music and make calls via Bluetooth.4. Built in Mic allowing hands-free function for phone calls.5. Line in connection available.6. Choose between English or Chinese voice prompts.7. Simulated dual microphone noise reduction.8. New elevated base design allows a clearer sound quality and richer bass, made music quality in outstanding. Specifications : Bluetooth compliance: Bluetooth V3.0 +EDROperation distance :≤10MOperation frequency: 60HZ-20KHZImpedance: 4ΩReceiving Sensitivity (TYP):-90dBm Output power: 3WAudio signal -noise ratio: >675dB USB charging voltage: DC 5VWorking voltage: 3.7VBuilt-in Power: Rechargeable 400mAh lithium-ion batteryWorking time: 4 hours on medium volumeAudio input: Bluetooth & LINE-INOveral dimensions: ¢75*57mmNet weight: 145g In operation state, when the battery is about to run out, Bluetooth speaker will make a prompt sound every 30 seconds, watch battery is too low, at this point you insert USB cable into the PC or the standard USB power adapter, insert the charger plug into the Bluetooth stereo charger port, Bluetooth stereo started charging. The red indicator light means it is charging. The red light not bright means the battery is filled. You can disconnect the charger and the device, and then to use this product. Package content : Wireless Bluetooth speakerUSB Charging Cable3.5 mm audio cableInstruction manual