Used each set only one time for passengers.

Still has protective plastic coating.

2 Sets Of Lightspeed Aviation Sierra ANR Aviation Headset GA/Dual Plug 4000

Tech Specs

Headphone Impedance

OFF Mono-180 Ω, ON Mono-300 Ω

OFF Stereo-250 Ω, ON Stereo-600 Ω

All @ 1kHz

Speaker Frequency Response (Active)

20Hz to 20kHz (volume sliders max)

Microphone Electret

Bias: 8-16V (Not polarity sensitive)

Bias Resistance: 220Ω-2200Ω

Sensitivity Electret

20mV-80mV across 8-16V

Bias Re: 94dB SPL input at 6mm

Frequency Response

200Hz-6000Hz

Maximum SPL for Microphone

114db

Power Source

Battery: 3V, 2(AA) Alkaline batteries (Average battery life 40 hours)

Maximum SPL for ANR

> 120dB @ 100Hz

Weight: 16 oz.

Bluetooth Enabled Phone: Yes

Bluetooth Streaming Music: Yes