Plug and Play, Easy to UseCustomers who use the line-in speaker do not need to download any apps, do not have to wait, plug in the phone to use. High Sound QualityThis mobile phone speaker with a 3w speaker in 4ohm and SNR>80db to keep the high sound quality with clear bass, can maximize the volume up to 4 times. Perfect Compatibility Compatible with any media device with a 3.5mm jack such as mobile phone, tablet, MP3, CD player, laptop, just turn power on and plug it directly to play music or video audio. Handheld DesignThe mini wireless speaker size is 47*47*34mm/1.8*1.8*1.3inch, compact and lightweight design, easy to pack in your pocket, briefcase, and handbag and carry to anywhere for using it anytime. 4-8H Battery LifeThis mini portable speaker come with built-in 300mAh lithium battery, does not consume cellphone power when playing. Once battery is out of battery, only 45 mins needed to get a full charge through the micro USB port(included)