The wires are 15" in length PP236: Photocell Assembly should be used with 104068-02 ignition control boards on oil fired heaters. Apply to DESA: Dayton, Knipco, Koehring, Master, Reddy, Remington, Sears, and TSC: (PP236, M16656-23, M1665623, M16656-24, M1665624) PINNACLE: ProTemp, Master, Remington, Heat-Stream, WorkHorse, Heat This photocell is used with heaters that have the hot surface ignitor (glow plug). UNLESS you have the DESA upper tier heaters that have the plastic handle and shroud that covers the fuel tank. That photocell is part# M16656-21 PP236: Photocell Assembly should be used with 104068-02 ignition control boards on oil fired heaters. The wires are 15" in length. Apply to DESA: Dayton, Knipco, Koehring, Master, Reddy, Remington, Sears, and TSC: (PP236, M16656-23, M1665623, M16656-24, M1665624) PINNACLE: ProTemp, Master, Remington, Heat-Stream, WorkHorse, Heat This photocell is used with heaters that have the hot surface ignitor (glow plug). UNLESS you have the DESA upper tier heaters that have the plastic handle and shroud that covers the fuel tank. That photocell is part# M16656-21 A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable).