Premium sound with portable charging case. Bluetooth. Wire-free. 4x battery power. Case charges buds. Deluxe Portable Charging Case: Wireless case charges earbuds up to 4 times. Charge on the go. 1. Comfortable design. 2. Control buttons. 3. Rechargeable battery. 4. Microphone. 5. Wire-free. 6. Extra silicone earpads. USB charging cable included. Features & Specifications: 1. Comfortable Design: Ergonomic design and fit. 2. Control Buttons: Wirelessly operate devices. 3. Rechargeable Battery: Recharge via included USB. 4. Microphone: Talk on the phone hands-free. 5. Wire-free. Design: Use with no wires attached. 6. Extra Silicone Earpads: Optional silicone ear-hooks. Wireless. Carry case. In-line mic. Isolation. Control. Comfort. Driver Unit: 15mm. Impedance: 16+/-3 ohms. Frequency: 20Hz-20 KHz. Rated Power: 150mW. Sensitivity: 100dB+/-3dB. Driver: 10 mm. Frequency: 20 hz-20 khz. Impedance: 16 +/-3. Sensitivity: 100db +/-3db. Power: 16mw. Mic Sensitivity: 36db. Playback Time: Up to 2 hrs. Range: 30ft/10m. Battery: 3.7v 400mah. Battery Type: Li-ion. Charging Cable: USB (included). Bluetooth: V4.20. Actual playback times may vary. Battery performance may be effected by multiple factors including but not limited to ambient temperature, listening volume, and/or distance from source audio device. Limited 90-day warranty. CE listed. sentryindustries.com. Visit sentryindustries.com for details please read manual before use & save for reference. Made in China.