• Wireless earbuds in charging case. • Power/Technology: Earbud battery (built into each bud): Rechargeable Lithium Polymer battery; Capacity: 40 mAh/3.7V; Input: 5V/60 mA; Play time: 1 hr. at max volume; Case battery: Rechargeable Lithium Polymer battery; Capacity: 200 mAh/3.7V; Input: 5V/200mA; Frequency response: 20Hz -20KHz; Transmit range: 10m (30 ft.); Wireless V4.2. • Playback time: approx. 4 hours • Item must be charged prior to first use. Charge time varies by device, minimum charge time 2 hours. • Case made of Aluminum and ABS Plastic. • Includes USB charging cable and instructions. • CE and FCC Approved. WARNING: Refer to the item manual for safety and warning instructions.