Our Patent product! Fill water by user!                                
-Works with all audio sources with a 3.5mm jack
-Rechargeable Lithium battery inside,USB charging                           
-Suitable for Mobile phone/tablet PC/mp3 player/Computer                                                                               
-Low-power Digital power amplifier module, output power:3.0W;
-Hi-fi stereo speaker (4Ω/3W)
-Input sensitivity ①AUX 450mV ②FM 380mV  
③TF/USB 450mV
-SNR≥68Db
-Charging Voltage: DC 5V
-Working Voltage: DC 3.7V
-Battery capacity: 1000mAH