North Bayou (NB F160) Ergonomic Desk Mount Dual Monitor Arm, Up To 17-27″ Size & 2-9kg Weight, Vesa 75mm x 75 mm To 100mm x 100mm Mounting Hole

Bluetooth Version: BT V5.3Frequency Range: 2.402-2.480 GHzTransmission Distance: Up to 10 meters (approximately 33 feet)Talk Time: Approximately 5-6 hoursMusic Playing Time: Approximately 5-6 hoursCharging Time: About 2 hoursEarphone Battery: 30mAhCase Battery: 250mAhHigh-Fidelity Speaker Size: 10mm