Bluetooth Speaker With LED Light. Plastic and metal material. 78 x 82.5 mm. Built-in Lithium-ion battery. Battery capacity: 700mAh. Working time: More than 5 hours. Charging mode: MICRO USB 5V. Charging time: According to different input power, generally 1-3 hours. Compatible with Micro SD. Speaker power: 4? 3W. Be applicable/compatible to: MP3/MP4/NPC/PDA/PSP/PC/CD/Walkman/IPod/ Mobile, etc. 78mm W x 82mm H x 5mm D