YISON headphones B5 wireless & wired BT 5.0 40mm 

Specifications

Speaker size: 40mm
Bluetooth Version: 5.0
Connection Range: 10 meters
Music/Talking Time: 17 hours
Charging Time: 1.5 hours
Stand by: 280 hours
Working frequency: 2402-2480 MHz
Frequency response: 20Hz-10KHz
Input Voltage: USB-C
Battery Capacity: 350mAh
Impedance: 32Ω +-15%
Sensivity: 107dB+-3dB
Wired Connectivity: 3.5mm audio