The 12v controls are now built into the handle of Ventrac 4520 / 4500 tractors for easy fingertip access. The 12-V Switch and Plug is required for select front mounted attachments and accessories including: EA600 (optional 70.8015 Seeder) KX523 & KX480 (optional 70.8025 actuator), KR502 Terra Rake (optional 70.8035 height adjustment kit), MA900 Boom Mower, KV552 V-Blade, & KJ520 Broom (optional 70.8211 actuator).