Model H-5010 Headset with Noise-shielded microphone A push-to-talk switch is located on the microphone shield. For noise levels over 100 dB.			Model H-5020 Headset with Noise-shielded microphone Behind-the-head version of H-5010. Soft adjustable strap fits under safety cap. For noise levels > 100 dB.
Model H-5030 Headset with Voice Tube Voice tube allows hands-free operation. Headset can be worn with tube on either side of head. For noise levels to 100 dB.			Model H-5040 Headset with Voice Tube Behind-the-head version of Model H-5030. Has soft adjustable overhead strap that fits under safety cap. For noise levels to 100 dB.
Model H-5090 (Not Shown) - Single-ear version of H-5030 - For quiet areas only
Note: Headsets have 30", 2-conductor cordset with 1/4" phone plug. Alligator clip adaptor available. See Accessories.

Handsets are available with or without push buttons and with coiled cordsets, straight cordsets or armored cable. Coiled (R) and straight (S) cordsets terminate in either alligator clips (C) or a phone plug (P). Armored cable (AR) models terminate in tinned wires. The handset pictured to the right is MODEL SPT-550 RP . Description Model Number No Push Button, coiled cord, plug SPT-525 RP No Push Button, coiled cord, clips SPT-525 RC No Push Button, straight cord, plug SPT-525 SP No Push Button, straight cord, clips SPT-525 SC No Push Button, armored cable SPT-525 AR Push Button, coiled cord, plug SPT-550 RP Push Button, coiled cord, clips SPT-550 RC Push Button, straight cord, plug SPT-550 SP Push Button, straight cord, clips SPT-550 SC Push Button, coiled cord, plug, PTT SPT-552 RP Push Button, straight cord, plug, PTT SPT-552 SP
The handset push button is the equivalent to a hang-up switch. Handsets without push buttons are therefore always on and are best limited to applications involving simple pair-phone operation. Handsets with push buttons are off-line until the push button is depressed and are intended for multi-phone set-ups. The PTT handset is wired so that only the transmitter is activated by the push button. The receiver is always on. This configuration is required by certain fire codes relating to high rise buildings.

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