The Alinco EMS-98 is Dynamic Desk Microphone with a built-in preamplifier and adjustable mic gain that can be adjusted using the mic gain control located on the bottom of the microphone. The EMS-98 Desk Microphone features a PTT switch, a PTT lock switch as well as transceiver channel up/down keys. 3 different microphone cables are included making the EMS-98 compatible with Alinco DR-735, DR-235, and DR-MD520 mobile transceivers. FEATURES & SPECIFICATIONS Integrated Amplifier Microphone Element Type: Unidirectional Dynamic UP/ DOWN Transceiver Channel Keys PTT & PTT Lock Buttons Power Requirements: 8VDC (Supplied by transceiver) Power Consumption: 10mA Dimensions: (W x H x D) 2.76 x 6.65 x 6.57 in. (70x169x167mm) Weight: 0.99 lbs. (0.45kg) * Please Note – The EMS-98 is also compatible with the DR-138, DR438, CS10, and CS25 transceivers however, the Up/Down keys will not function properly