Product description Color: white black Speaker driver: 27mm 8 Power: 3W S / N: 90dB Frequency: 100 ~ 20kHz Battery: Lithium battery 250mAh Charging time: 45 minutes Playing time: 8 hours Dimensions: 42.5W * 58H * 31.Dmm Package contents: 1 * small inline speaker, 1 * USB cable 1. PLUG and PLAY: The 3.5mm aux jack makes it much easier to play the music whenever you want, via the iPhone, iPad or iPod. No more worrying about the "Bluetooth disconnected". 2. COMPACT SIZE with HIGH SOUND QUALITY: With the compact size, which is as small as half a credit card, this product has a 3W speaker in 27mm 8ohm and SNR> 90db to keep the high sound quality with clear bass. 3. COMPREHENSIVE COMPATIBILITY: This line in speaker could be used for most of the smartphones with 3.5mm aux port, even those with phone cases. It is also suitable for the desktop / laptop computer, tablet / pad, MP3 / MP4, TV or PSP with no connection or paring issues like the bluetooth one. 4. LONG BATTERY LIFE: This mini portable speaker has a 250mAh Li-ion battery built in to provide around 8 hours of playtime. Once idle for 5 minutes, the auto-off function works to save energy. Once battery drained, it only takes 45 minutes to get a full charge through the micro USB port. 5. EASY TO CARRY Small and easy to carry. You can put it in your pocket, bag, briefcase, etc. and enjoy your music anywhere.