True Wireless Stereo 5.0 Earbuds IPX5 Waterproof Version: Bluetooth 5.0 Waterproof Special Edition Wireless Single Enhanced Built-in MIC Impedance: 16Ω Total harmonic distortion: ≤3% Sensor Touch Comfortable Fit True Wireless Frequency: 20Hz～20kHz Playback time: 4 hours (50% volume) Connection range: ≥15M Input voltage: DC5V Appearance material: Alloy + ABS Speakers: Ф6mm*2 HIFi stereo Battery: Hesdset 45mAh Csbin 450mAh