Normally closed magnetic contacts with a short 3/4" switch.
Excellent experience with this vendor
82-4750 - 12V 5.0Ah Rechargable Sealed Lead Acid Battery
ELK Sealed Lead Acid Batteries are excellent for the following applications with regard to size, Amp hour rating, and proper terminal connections: battery backup (for Access Control Systems, Fire Alarm Systems, and Security Alarm Systems), emergency lights, lighte...
82-13881 - Recessed Alarm Switch White Stubby Switch And Magnet
21-1050 - Tube Solder
Tube type dispenser makes holding solder easier 7' of high quality .040" diameter solder 60/40 370°F melting point
MCM is a great company. Very fast service and shipping of Raspberry Pi. Will tell all my friends to buy from MCM