This product works great! I love how my back porch is without biting mosquitoes! I wonder how long this bulb will last - i've read on here that others leave theirs on for 24hrs and some use daily - I only use it when I'm out in the back or the front and it seems to keep the biting boogers at bay. I also purchased an extra bulb for this unit as well - not the one made exactly for this (with the model #) - I purhased the Stinger B1515-BL bulb for only $8 vs the $18 (Flowtron BF-35 Replacement Bulb for BK-15D). The Stinger B1515-BL bulb is actually a black light and has four prongs - something I prefer much better than the white light I got with the zapper. I'll wait till the bulb burns out to change it to the black bulb! I plan to use this for camping and will see how well this works on a deep cycle battery! Thanks for such a great product!