• Mini wireless speaker key chain made of Aluminum Alloy with ABS Plastic. • Power/Technology: Rechargeable Lithium battery; Input: 5V; Capacity: 140 mAh; Sensitivity: 100±3dB at 2kHz; Frequency Response: 20Hz - 20 KHz; Transmission Range: 10m (30 ft); Wireless 4.2 • Playback time: approx. 2.5 hours, depending on usage. • Must be charged prior to first use. Charge time varies by device. Minimum 2 hours. • Features LED indicator light, that shines red while charging (light goes off once charge is complete). • Instructions and charging cable included. • FCC Approved