Technical Specs Power Bank Speaker: Length: Approximately 5.5″ Width: Approximately 1″ Product size: 27x136x27mm Power: 2W Frequency range: 200-20000Hz Sensitivity: 90db+-3 Resistance: 4Ω Battery Capacity: 4000 mAh USB Input Voltage: 5V USB Input current: 800 mAh USB Output voltage: 5V USB Output Current: 1000 mAh User Manual Instructions: (To Play Music) Take out the product top cover, insert the two 3.5mm audio plugs to the audio port of the product and of the phone. LED Light turning blue means that the connection successful. Adjust the volume and press the play button on the phone. The product will recognize the audio signal automatically and play. (To Charge Smartphone) Take out the product top cover, connect the smartphone to the product via the data/charging cable (that comes with the smartphone), and the charging process will begin. (To Charge the Product) Take out the product top cover, insert the 3.5mm audio plug (of the charging cable) to the audio port of the Product and then insert the USB plug (of the charging cable) to any USB supported power adapter or your computer, and the charging process will begin. *Please fully charge the product before first use* Indicator Light instructions: (Starting from light nearest to the top cover) *LED Light 1 will show red when the product is charging a device. *LED Light 2 will show blue when the device has been fully charged. *LED Light 3 will show blue when an audio device has been connected successfully. Warning: -To prevent damage to the product, please use only the original charging cable provided by our company. -Please double check input voltage of any device before charging. -Please prevent dropping, knocking, disassembling or attempt to fix this product. -Please do not drop this product into water or make it wet. -Please do not throw this product into fire or heat it. -This product may be slightly warm during charging, which is normal for any charging device. The following actio