equipment refers to some big electronic items or working tools. It can be referred to all electronic things. device is more commonly used for small electronic items that can be carried with hand.

Also you may call them electronic systems.

Hi Apple. When I hear "equipment" I immediately think of a tool. That is, equipment is something someone uses to get some sort of job done. So "equipment" can be several different things like a carpenters tools, a police officers weapon, and a chefs cooking utensils. I don't know if it's the same word in Chinese, but in Japanese it would be 装備. A device is similar to a tool, but it has the nuance of being electrical or mechanical in nature. Also size doesn't really matter. A device can be big or small. I hope this helped.

I concur with Casey and I'd say that a "device" is a type of equipment. Equipment normally refers to something specifically used for a task or line of work. ie. "The band needed help unloading all of their sound equipment" or "The scientist's laboratory was full of all kinds of strange equipment". Normally something singular like a phone or a computer/laptop is referred to as a device. I can only really speak for American English but I've never really heard any refer to their personal phone, computer, laptop, tablet as "equipment"