Bluetooth. 4 hours playtime. Auto pair. Auto on. Wire-free. Easy pairing. 4 hours Playtime. Built-in controls. Charging case. Auto pairing technology. Open case & sync device. 4 hrs playtime up to 4 hours of playtime. Phones, tablets, computers. Built-in mic + controls. Portable charging case. Driver: 10MM. Sensitivity: 100 DB +/- 3 DB. Playback Time: Up to 4 hrs at 50% volume. Frequency: 20HZ - 20KHZ. Power: 16MW. Range: 30FT/10M. Impedance 16 +/- 3 omega. Mic Sensitivity 36 DB. Battery: 3.7V 200 MAH. Battery Type: Li-ion. Bluetooth: V.50 Charging Cable: USB (included). Limited 90-day warranty from defects in materials or workmanship. sentryindustries.com for details. CE listed. sentryindustries.com. www.P65Warnings.ca.gov. Made in China.