For the customer who is only using a 24 volt or less system, you have the low voltage STI. A small pellet on the end of the chip will cause a pop, lighting Shock tube and Thermotube.
Attention for time critical orders! Through a special permit, USPS will allow us to ship by Parcel Post only. This process is not like priority, and normally is 5-10 business days. It does not track, or move on weekends, like priority mail. It will show you an incorrect delivery date and only update when it leaves our local office and arrives at yours. It will not update along the way