When you arrive at your workplace, lay the circular saw case flat, open the cover, and take the circular saw out. Take the gloves, glasses and guiding ruler out of the box. You can also put your mobile phone on the cover of the box and connect to the speakers by Bluetooth. When you finish the work, you can put the saw and accessories back to the box, and same for these additional tools, close the box, and attach it to the bar together with the small tool box, and you can leave.