Description‎:‎ Compatible with most devices that may utilize headphones LED power indicator for power on and charging 360‎-degree sound field intergrates a cone design with a custom‎-built speaker to project sound in all directions‎.‎ With 1.4 subwoofer‎,‎ the vacuum base offers deep and rich sound with HI‎-FI result Pioneering patented technology‎:‎ extendable resonance of the bass box technology enables stronger effect New concept integrative portable mini speaker‎,‎ with small bulk can play on the center of the palm Embedded type lithium batteries‎,‎ can use USB or power adapter for charging‎.‎ More convenient and user‎-friendly‎,‎ cost‎-saving pruphase batteries‎.‎ Built in‎,‎ rechargeable lithium battery each charge can last for 3~5 hours‎.‎ Colour‎:‎ Black More details about the speaker‎:‎ Output‎:‎2.4w Rating power‎:‎1.8w Size‎:‎50wX50LX35H‎(‎mm‎)‎ Speaker‎:‎36mm micro speaker‎,‎4Ohm Frequency response‎:‎100Hz‎-2kHz Singal‎-to‎-noise‎:‎>85dB Distortion‎:‎