12V A23 Battery Holder with Wire

2 Pcs Micro Limit Switch with Roller, The switches are suitable for a voltage of up to 250VAC (30VDC) and a current of 3A.

Single AA Battery Holder With Wires

0.8mm Tin Lead Solder Wire Tube Flux 40/60 with Flux Rosin Core for Welding PCB Work

3-24V Piezo Electronic Tone Buzzer Alarm 95DB Continuous Sound

ON/OFF button type switch 

XT60 Plug Male Female Bullet Connectors For High current Applications ie. Heatbeds, Batteries, Speakers ...  Capable of 60A sustained current...