YX12 Single Ear Invisible Bluetooth Earphone Mini Sleep Stereo Wireless Earphones 1. Ultra-small portable mini design, with the pocket compact no burden 2. Low power consumption and more energy-saving, strong power reserves 3. Large diaphragm loud speaker sound, HIFI high-fidelity sound effect 4. Lightweight, comfortable and close to the ear, monaural invisible and no sense of pressure 5. Simultaneously connected to two devices, switching at any time, listening to music, answering the phone at the same time 6. Bluetooth 5.3 chip, faster and more stable connection 7. Synchronization of audio and video, smooth gameplay without lagging Parameters: 1. Bluetooth version: V5.3 2. Chip: JL6973 3. Transmission distance: about 10m 4. Eeaphne battery capacity: 35mAh 5. Speaker: F8 real copper ring 6. Listening and talking time: about 4 hours; charging time: about 1 hour 7. Frequency: 20Hz-20KHz 8. Impedance: 32 ohm 9. Sensitivity: 115dBmW 10. Waterproof grade: life waterproof Packing list: - Eeaphne x 1 - Charging cable x 1 - Instruction manual x 1 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.