Model:M21; Connection:Bluetooth 5.1; Frequency Response:20-24800; Impedance:32; Activity:Cycling,Trekking,Gym Workout,Jogging,Running,Outdoor,Driving,Everyday Use,Traveling,Airplane; Charging Port:USB Type C; Capacity:40; Type:In Ear; Wireless/Bluetooth Range:10; General Use:for Mobile Phone; Communication:Wireless; Standby Time:90; Item Type:True Wireless Headphones TWS Earbuds; Brand:NIA; Features:ENC Environmental Noise Cancellation,Smart Touch Control,with Charging Box,with Volume Control,Stereo; Listing Date:12/12/2022; Music Time:4; Bluetooth Codecs:Support AAC,Support SBC; Charging Box Capacity:300; Headphone Size (Single):311928; Headphone Weight (Single):4; Charging Case Size:454531; Charging Case Weight with Headphones:0.232; Headphone Noise Control:ENC Environment Noise-Cancelling