Portable plastic speaker requires no cables to play music, just charge and connect to wireless-capable device. Includes on/off and wireless enable switch on bottom of device and features LED indicator light (blue light when wireless connection is made, red light when speaker is charging, and light turns off when charge is complete). Up to 3 hours of playback time. Charge time differs by device. Charge required before first use. To charge device simply connect one end of USB cable (included) to "Charge" port on speaker and the other to computer or USB to AC adapter. Power supply / Technology: Transmission range of approx. 30 feet (10 meters or 393 inches); Voltage: 3.6V-4.2V; Work current:<30mA (Wireless module); Work current: <250mA (power amplifier, Wireless); Standby current: &l...