This is the 220v single pole timer used on many commercial beds that have relay/contactors. If you need the dual pole (aka: dual layer) type, then choose it instead of this. This is s non-returnable item, except for defect. Knob is not included. 1213b$79.99 SITEMAP Red Light Therapy Red light beds Shipping  -   Support Tanning Lamps SunMaster  -  ClearTech Other   -  Lamp Kits Accessories Rebuild Kits  -  Lotion Eye protection/stickers  -  Cleaning Parts Ballasts  -  Timers Buck/boost transformers