40MM Drivers for Clear Audio in the Fantech WH03 GO Air Bluetooth 5.0 Wireless Headphone with Dual Connection Uncomplicated, undistorted sound! Listen to your music the way it was intended to be heard. Two-Mode Linkage The WH01 headphones' 3.5mm jack cable mode and Bluetooth Ver 5.0 Long-Lasting Battery Life—which allows for up to 20 hours of use at 70% volume and up to 200 hours in standby mode—are the ideal combination. Adequate for everyday usage Ideal Comfort With luxurious imitation leather ear cushions, enjoy your favorite music.