1.USE LED SAVE80% ENERGY. 2.MEATL TUBE CAN GET ALL VISION FOR EVERY WORKER. 3.EASILY INSTALL WITHIN FEW MIUNTES. 4.POWER SOURCE FROM SEWING MACHINE MOTOR SWITCH MACHINE MOTOR SWITCH. 5.WHEN ORDER PLEASE SPECIFY: MODEL:DS-27SL . DS-98SL VOLTAGE:AC 100V~240V