Premium sound with portable charging case. Bluetooth. 4 hours per charge. 12 hours total playtime. Microtechnology. Inductive charging. Auto on auto pair. Microphone + controls. Charging case. Auto Pair & Auto On: Open case and buds will auto sync to your device. Play Controls: Remotely operate your device from the earbuds. Deluxe Charging Case: Case charges buds 2x times for 12 total hours of playtime. Built-In Microphone: Switch between tunes and talk on the go. Wire-Free Bluetooth: Connect and control your bluetooth capable devices. All Day Battery: Long lasting battery life will get you through the day. Driver Unit: 10 mm. Impedance: 32 ohms. Sensitivity: 103dB+/-3dB. Frequency: 20Hz-20KHz. Bluetooth: Version 5.0; Battery: Lithium-ion. Auto pairing technology. 12 hrs playtime long lasting all day battery. Open case & sync case. 2x charge. Charge earbuds 2x times on the go. Control buttons play, pause, skip. Built-in mic + control buttons. Portable charging case. Actual playback times may vary. Battery performances 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 from defects in materials or workmanship. Visit sentryindustires.com for details please read manual before use & save for difference. CE listed. sentryindustries.com. Made in China.