Sentry Earbuds, True Wireless

4x battery power. Case charges buds. Premium sound with portable charging case. 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 Hans-Free. 5. Wire-Free Design: use with no wires attached. 6. Extra Silicone Earpads: optional silicone Ear-Hooks. Deluxe Portable Charging Case: wireless case charges earbuds up to 4 times. Charge on the go. USB charging cable included. Driver unit: 15mm. Impedance: 16+/-3 ohms. Frequency 20Hz-20KHz. Rated Power: 150mW. Sensitivity: 100dB+/-3dB. Battery: Lithium Ion. Wireless. Carry case. In-line mic. Isolation. Control. Comfort. Driver: 10 mm. Frequency: 20HZ-20KHZ. Impedance: 16+/-3 ohm. Sensitivity: 100DB +/-3DB. Power: 16MW. Mic Sensitivity: 36DB. Playback Time: up to 2 hrs. Range: 30ft/10m. Battery: 3.7v 400 mah. Battery Type: Li-ion. Chargeable 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. CE listed. sentryindustries.com. Made in China