Noise Cancelling: Active Noise Cancellation (ANC), Environmental Noise Cancellation (ENC) Waterproof Standard: No Headphone Form Factor: In Ear Touch Screen: No Estimated Battery Life: More Than 20 Hours Volume Control: Yes BT Wireless: V5.4 Chipset: JL Battery Capacity (Charging Case): 420mAh Brand Name: Havit Place of Origin: Guangdong, China Product Name: TWS Earbud Battery: 40mAh × 2 Charging Case Battery: 420mAh Play Time: 6.5H (60% Vol.) / 5.5H (60% Vol. with ANC ON) BT Version: V5.4 Speaker Frequency: 20Hz ~ 20KHz Speaker Size: 10mm × 2 Input Voltage / Current: DC 5V / 1A Sensitivity: 115.8 ± 2dB Impedance: 32Ω ± 15%