1.Supports mp3 fomate in /TF card reader/Aux-input/Support stereo earphone. 2.Works with all audio sources with a 3.5mm jack 3.Rechargeable380mAh lithium battery inside 4.FM auto-scan radio 5.Alert or SOS 6.Stripe included 7.Other country map or other logo/artworks are also available - Low-power Digital power amplifier module, output power:3.0W; - Hi-fi stereo speaker （4Ω/3W） -Input sensitivity ①AUX 450mV ②TF 450mV - SNR≥68DB - Charging Voltage: DC 5V - Working Voltage: DC 3.7V -Battery capacity: 380mAH