Used working  UVP Entela M-20  UV lamp transilluminator , 115v, the lamps works as pictured ; the switch from high to low mode works good., Filter Area: 8x8 cm . several tiny  scratches as pictured.. 115v. If not satisfied, You can return this unit within 30 days for a full refund minus shipping. lot Bsmfarcent Sibgene  LLC EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.