ONUKI i100 Bluetooth Headphones, Best Wireless Earphones Sports, Running, Gym Workouts. 2018 Upgraded. IPX7 Waterproof, Sweatproof. Noise-Cancelling Earbuds w/Mic Frequency Response: +/- 3dB: 33 Hz - 30 KHz Nominal Independance: 6 Ohms Power Handling (RMS): 150 W Recommended Amplifier Requirements (RMS): 40 - 150 W External Dimensions: (H x W x D) 38 3/16 x 7 7/8 x 11 13/16 inch