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| Honeywell Wired Headsets | 159
Enclosure rating Meets IP67
Humidity 5-95% condensing
Noise Reduction Rating Not applicable
SR-20 with coiled cord
Weight
6.5 ounces (184 g) with cable
3.9 ounces (110 g) without cable
Operating temperature -40°F to 122°F (-40° to 50°C)
Storage temperature -40°F to 158°F (-40° to 70°C)
Enclosure rating Meets IP67
Humidity 100% condensing
Noise Reduction Rating Not applicable
Note: Packaging varies for product shipments. Generally, packing materials are about 15% of the total
shipment weight.
SR-21 Headset Specifications
Weight 5.0 ounces (141 g) with cable
3.9 ounces (110 g) without cable
Operating temperature -40°F to 122°F (-40° to 50°C)
Storage temperature -40°F to 158°F (-40° to 70°C)
Enclosure rating Meets IP67
Humidity 100% condensing
Noise Reduction Rating Not applicable
Replacing the Ear Pad on the SR-20 Series Headsets
1. With headset removed and disconnected, rotate the microphone boom so that it is in line with the headset yoke.
2. Hold the headset by the yoke in one hand. With the other hand rotate the earpiece counter-clockwise 10°.
3. Disengage the earpiece section from the headset.
4. Remove the worn foam cover.
5. With the black O-ring gasket facing out, place a new ear pad over the ear pad mounting disk.
If the ear pad mounting disk does not have a black O-ring gasket attached to it, performance may be affected. You
must replace the entire ear pad mounting disk, which includes the black O-ring gasket.
6. Line up the keys on the earpiece to the headset, connect the mounting disk.
7. Rotate the earpiece clockwise 10° to secure it. Note that the earpiece will not engage with the headset if it is
backwards.