Speaker zone of PAM-340A/480A PCT-610/620 can be controlled by RM-05A. There are 4 levels of chime in PAM-340A/480A PCT-610/620 which can be triggered by chime/talk switch and after chime is finished announcement from mic will be made while pushing switch button. 10 segments led display on the front panel indicates signal output level of RM-05A at real time. Highly sensitive condenser type mic is used for clear broadcasting. RM-05A is the dedicated remote control amplifier for PAM series so it only can be used with PAM-340A/480A PCT-610/620. Chime melody can be muted by simple operation.