Z5C Using Double ES9039Q2M Decoder Chips Double ES9039Q2M Chips | About 7 hours of battery life3.5mm/2.5mm/4.4mm jacks | Support bluetooth mode | Aluminum alloy housing Power onPress and hold the SEL key for 3 seconds Normal ShutdownPress and hold the SEL key for 3 seconds Lock KeyPress and hold the Left+center key for 3seconds at the same time Unlock KeyPress and hold the Left+ center key for 3seconds at the same time Forced ShutdownWhen the Z5C is inoperable, you canpress and hold the SEL key for 6 secondsand the Z5C will be forced to shut down. Restore Factory Settings First turn off the Z5C, then press andhold the left key, and then press the SElkey for 3 seconds. When Factory...okappears on the screen, the factory set-tings are successfully restored. Colour:Black Material:plastic Package Contents: 1 x Music HIFI Player Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.