Portable stereo speaker is made of sturdy aluminum enclosure. Comes with the digital amplifier that has 2 x 3W output and integrated rechargeable lithium battery of 3.7 V and 1000 mAh. Playtime is up to 100 hours, the sound quality is great and the battery life is extreme. Music Angel Friendz Red Speaker can be connected to other Friendz for increased volume. This device is compatible with iPhone, iPad, iPod, MP3-players, PC / MAC and all digital audio sources that have a 3.5 mm headphone output. When purchasing this device you will also get two cables, a jewelry pouch and user guide. The speaker can charge from PC / MAC and standard-USB charger. Charge time is 1-3 hours.