GLSP model 144-S8 selectable program solid state flasher is an 8 circuit unit with the option to select between multiple chase patterns by turning a dial. A list of the preprogrammed sequences available is printed on each unit. This gives you a single flasher that can do the job of many with a combination of reliability and versatility. Offering noiseless operation with no mechanical contacts encapsulated to protected against shock, vibration and moisture. With high load capacities and superior heat dissipation, solid state flashers are a reliable way to easily handle any flashing and chasing need. The robust design of GLSP solid state flashers lets them provide more amps than industry standards. All models have easily adjustable speed controls and most models offer replaceable triacs.