SM30
The SM-30 is an unidirectional, electret microphone designed for base station operation with an Icom transceiver

Microphone type: Unidirectional electret condenser mic (preamp built in)
Impedance: 600 ohms
Sensitivity: -28 db +/- 4db
Power requirements: 8VDC (supplied from transceiver)
Cable length: 3' 3"
Weight: 12.3 ounces

RLPS30M

30 amp surge, 25 amp continuous
3.5 lbs
Compact 6"w x 2 1/2"h x 7 3/4"d
Lighter plug on the front
High current binding posts on the back
Over current protection
Over voltage protection
Quiet internal cooling fan
AC line fuse 8 amps 110V
Ripple: Less than 80mVp-p at rated load