Headsets

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	Sierra	Zulu 3	Zulu 4	Lightspeed Delta Zulu
Price	$749	$949	$1,099	$1,299
Weight	16 oz.	14.6 oz.	14.6 oz.	14.9 oz.
Warranty	5 Years	7 Years	7 Years	7 Years
Materials	Plastic earcups, plastic headband, TPE jacketed cable	Magnesium earcups, stainless steel headband, Kevlar-reinforced cable	Magnesium earcups, stainless steel headband, Kevlar-reinforced cable	Magnesium earcups, stainless steel headband, Kevlar-reinforced cable
Active Noise Reduction (ANR)	✔	✔	✔	✔
Power	AA batteries	AA batteries	AA batteries	Lithium-ion rechargeable or AA batteries
ANR Maximum SPL	>120 dB at 100 Hz	>125 dB at 100 Hz	>125 dB at 100 Hz	>125 dB at 100 Hz
Plug Configurations	Dual GA	Dual GA U-174 (Heli) LEMO (panel power)	Dual GA U-174 (Heli) LEMO (panel power)	Dual GA U-174 (Heli) LEMO (panel power)
Bluetooth	✔	✔	Dual Bluetooth	✔
Comms Recording w/ App	✔	✔	✔	✔
Microphone	Noise-cancelling electret microphone	Noise-cancelling electret microphone	Noise-cancelling electret microphone	Noise-cancelling electret microphone
Microphone Frequency Response	200 Hz-6000 Hz	200 Hz-6000 Hz	200 Hz-6000 Hz	200 Hz-6000 Hz
Headphone Nominal Impedance @ 1 kHz (mono)	180-300 ohms	200-280 ohms	200-280 ohms	275-295 ohms
Headphone Nominal Impedance @ 1 kHz (stereo)	250-600 ohms	400-560 ohms	400-560 ohms	575-590 ohms
Ear Seals	Performance Ear Seals	Performance Ear Seals	FrameFit™ Ear Seals	Performance Ear Seals
Bluetooth Vocal Isolation			✔
Carbon Monoxide Sensor				✔
HearingEQity Customized Hearing Profile				✔

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