Specifications: 1.S/N: >80dB 2.Net Weight: 43.5g 3.Output Power: 2W 4.Material: plastic/silicone 5.Playing Time: about 4 hours 6.Frequency Range: 80Hz -20KHz 7.Charging Time: about 45 minutes 8.Product Size: 41Wx41Hx32D mm 9.Loudspeaker Specification: 28mm 10.Enlarge phone volume more than 5 times 11.Li-ion Battery Capacity: 3.7V, 250mAh User Manual: 1.Press the power key for 3 seconds, the speaker will start working and the green indicator will be light. 2.Just connect this speaker's 3.5mm jack to your device to play music, like mobile phone, tablet, MP3, CD player, laptop, just turn power on and plug it directly to play music or video audio. 3.Press the power key again, the speaker will stop working and the green indicator is still on. 4.Press the power key for 3 seconds, it will be turned off. Package includes: 1 x Wireless Mobile Phone Speaker 1 x Charging Cable