Model Number: HX-Z01-#1348 Brand Name: OEM Key Specifications/Special Features: 1. Noise canceling headset for walkie talkie2. Heavy duty type, work in very noisy environment3. Flexible PTT to use4. Big microphone for pilot to talk5. For all kinds of two-way radio DP3400, DP2000, P6600, GP388, and so onSpeaker:Type: sensor dynamic speakerFrequency response: F0 - 14KHzSensitivity: 91 ± 3dB/1 watt 0.5MImpedance: 8Ω ± 15% @ 1kHz
Resonance frequency: (F0) 14,000Hz ± 20%

Microphone:

Sensitivity range: -44 ± 4dB RL = 1.0K Ω Vs = 2.0V (DC) 1kHz
Frequency: 20-20kHz
Operating voltage range: 1.0V-10V (DC)