TCL In-Ear True Wireless Bluetooth Headset, Frequency of response 10-22K, Sensitivity 100 dB, Driver Size 6mm, Impedence 14 Ohm, Max power 20mW, Wireless Charging, Playtime 6.5h/33h, IPX5, Bluetooth 5.0, A2DP, AVRCP, HFP, HSP, USB-C, Color Copper Ash