Both the 65 series and 77 series transmitters will sync with the DHXR4. They feature an LCD display with a battery life indicator. The 77 Series transmitters also features a lockable mute button and have the ability to manually select the channel in addition to the sync function. All transmitters are powered by 2 AA batteries. The HH65 handheld transmitter is available with either a dynamic cardioid (HH65) or condenser super cardioid (HH65SC) element. The body pack transmitter has a 0/-10/Mic selector switch.