M21 2pairs Bluetooth 5.2 Earphones TWS Wireless Couple Noise Canceling Waterproof Earbuds 1. This wireless Bluetooth headset can use 4 earphones with two mobile phones at the same time (one pair of earphones with one mobile phone). When one pair of earphones is turned off, you can use another pair immediately. 2. Bluetooth 5.2 chip, compatible with all Bluetooth-enabled mobile phones, tablets, laptops, etc. 3. The combination of long-handled earplugs + bean-shaped earplugs meets different usage needs 4. The large-capacity charging compartment can charge the earphones multiple times, and the earphones can be fully charged for 5-10 hours of continuous listening 5. The earphones have a built-in high-sensitivity touch panel, which can intelligently identify your intentions with a light touch and quickly complete various operations 6. Adopting CVC8.0 and DSP dual noise reduction technology, it filters environmental noise and effectively and accurately picks up sound 7. IPX7 waterproof, no fear of rain 8. 360-degree panoramic sound effects enhance the depth, presence and spatial sense of sound, and highly analyze the surround stereo effect, allowing you to enjoy immersive enjoyment Parameters: 1. Bluetooth version: V5.2 2. Charging box battery capacity: 1200mAh 3. Earplug battery capacity: 50 mAh 4. Working distance: 10 meters (barrier-free environment) 5. Battery life: about 180 hours 6. Standby time: about 220 hours 7. Rated input: 5V 8. Impedance: 32 ohms 9. Speaker size: 8mm 10. Frequency response: 20Hz-20KHz 11. Charging port: Type-C 12. Operation mode: Smart touch 13. Material: ABS+PC