MC-24 Umsteigerset 35 MHz B Graupner 4829.99.B For the 35 MHz B-band 24-channel micro-computer transmitter with integral battery, SUPER-SOFT MEGA-ROM, transmitter HF module on the appropriate frequency, smc-20 S 20-channel SPCM superhet receiver on the same frequency, switch harness, pair of crystals on the same frequency.