Original Lenovo X18 IPX4 Waterproof Bluetooth 5. 0 Touch Wireless Bluetooth Earphone with Charging Box, Support Call & Siri1. Bluetooth 5. 0, no freeze when connecting 2. Can transmit high-quality music with low distortion and enhance listening experience 3. IPX4 waterproof level, no fear of sweating in daily exercise 4. Can be used with one headset or two headsets together 5. Open the box and take out the headset will automatically connect 6. Intelligent touch control, simple operation 7. Easily wake up the voice assistant to make your life smarter 8. Portable charging box, not only allows you to charge the headset at any time when going out, but also can be used as a storage box for the headset 9. Lighter than 4 grams, ergonomically designed to fit the ears seamlessly, without pain for a long time Product Specifications: 1. Headphone box size: 595x403mm 2. Bluetooth version: 5. 0 3. Bluetooth distance: less than or equal to 20m 4. Microphone: -42dB 5. LED light color: red and blue 6. Call duration: about 5-7 hours 7. Single earphone battery capacity: 3. 7V 60mAh 8. Charging box battery capacity: 2600mAh 9. Frequency response range: 20Hz-20KHz 10. Charging time: less than or equal to 2 hours