Experience premium sound and portable charging capabilities with the Sentry Tru Wireless Bluetooth Earbuds. Just pop the buds into the included charging case and you’re listening to your favorite tunes in no time. Bluetooth Wireless. Hands Free Mic. Charging Carry Case. Easy Sync Buds. Noise Isolation. Extra Silicone Earpads. Wire-Free Design. Rechargeable Battery. Driver: 10mm. Bluetooth: 5.0V. Sensitivity: 103 +/- 3dB. Frequency: 20-20KHz. Impedance: 32 ohms. Charging Case Battery: 380-400mah. Earbud Battery: 50mah. Earphone working time: about 3 hours. Earphone charging time: about 1 hour. Case charging time: 3-4 hours. Imported.