Description: Type: Earplug Material: ABS reusable: Reusable Insert Method: Push-In Shape: flange type Place of Origin: Guangdong, China Batteries Included: No Cord: Included Brand Name: Nier Model Number: DZ03 Foldable: Yes Interface: AUX Power Supply: Dry cell Voltage: 3.7V Intrinsically Safe: Yes Brand: Nier Model: DZ03 Noise Reduction Level: NRR: 33dB±3 Microphone Sensitivity: -42dB±3 (0dB=1V/Pa 1KHz) Microphone Impedance: ≤2.2K ohm Speaker Sensitivity: ≥110dB/mW(1.0KHz) Speaker Impedance: 200 ohm±15% Pickup Enhancement: 10dB±3 Operating Time: ≥8h Protection Level: IP67 Selling Units: Single item Single package size: 10X10X8 cm Single gross weight: 0.450 kg Location: Shenzhen Guangdong china