Langsdom P91 IPX6 Waterproof Noise Reduction TWS Wireless Bluetooth Earphone(Black)

1. 13mm dynamic speaker, balanced among high, middle and low frequencies, making the sound more pure and natural.2. The earphones use the noise reduction system to generate reverse-phase sound waves that are equal to the external noise, neutralizing the noise, thereby achieving the noise reduction effect.3. HiFi sound quality, improves high-frequency compliance, reduces distortion, rich in details, clear and natural vocals, and more penetrating sound quality.4. Vortex in-ear design, 360-degree surround experience.5. Parameters:- Chip solution: Jerry AD6973D- Bluetooth protocols: HSP, HFP, A2DP, AVRCP- Bluetooth version: 5.3- Frequency: 2.402-2.480Ghz- Working distance: greater than 10m- Bluetooth antenna method: ceramic antenna- Frequency range: 20HZ-20KHZ- Sensitivity: 103dB 1KHz-Battery capacity: earphones 30mAh, charging case 230mAh- Playing time: about 3~4 hours- Charging box charging voltage/current: 5V 0.5A- Impedance: 32 ohms- Rated power: 3mW