Clear-Com RM-704 Encore 4-Channel Remote Station Wired Intercom it is a popular choice

it is a popular choice in studios

Cardioid pattern of the condenser mic delivers quality sound reinforcement in professional recording

Aside from the power/mute button

but also extremely low latency

ADX1M bodypack transmitters (sold separately) exclusively use SB910 lithium-ion rechargeable batteries

Clear-Com RM-704 Encore 4-Channel Remote Station Wired Intercom it is a popular choiceThe RM 704 is a 2RU four channel remote station with programmable front panel buttons and individual channel volume control. The RM 704 is powered directly from the intercom line and requires no external AC power. Unlike the MS 704, the RM 704 has no power supply, circuit breaker or linking function.