CLS721 CLS725 CLS729 HIR-HP1 HIR-KT1
100'+ 100'+ 100'+ 20' line of sight 20' line of sight
72.1 mHz 72.5 mHz 72.9 mHz infrared infrared
Color-coded hardware
yellow blue green - -
on earcup on earcup on earcup on earcup on earcup
yes yes yes yes yes
Built-in antenna
yes yes yes yes yes
Rechargeable nickel metal hydride battery
yes yes yes 2 "AAA" 2 "AAA"
Hours of operation on a single charge
6 hours 6 hours 6 hours >8 Hours >8 Hours
AC adapter
yes yes yes - -
CLS721T CLS725T CLS729T - USB Adapter
Automatic sleep mode
- - - yes yes
1 year 1 year 1 year 1 year 1 year

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