The Kenwood TV-502 is a 2 meter transverter for the TS-520S series. It operates from 144 to 146 MHz with 16 watts input.
The similar Kenwood TV-506 is a 6 meter transverter allowing operation from 50 to 54 MHz with 16 watts.
Physical: 6.675 x 6 x 11.5 inches 11.5 lbs. (168x153x336mm 5.2 kg).