Silicon ear tipPU cable compliance with ROHS contain high intensity Kevlar is very strong and durable. Waterproof Level: IP54 Speaker: OD: 16mm, Resistance: 90Ohm±15% at 1000Hz, Sound Pressure Level: 90dB±3dB at 1000Hz, Rated Power: 100mW, Max Power: 200mW Microphone: Type: Electret microphone, Sensitivity: -40dB±3dB at 1000Hz (0dB=1V/Pa), Resistance: 2.2KOhm