TCL In-Ear True Wireless Bluetooth Headset, Frequency of response 9-22K, Sensitivity 100 dB, Driver Size 5.8mm, Impedence 13 Ohm, Max power input 20mW, Playtime 6.5h/26h, IPX4, Bluetooth 5.0, A2DP, AVRCP, HFP, HS, USB-C, Color Phantom Black