A box includes a frame, a base plate, a fastener, a sealing member, and a connecting member. The base plate and the frame enclose an accommodating cavity. The fastener includes a body, a flange portion, and a stop portion. The flange portion is disposed at one end of the body. The stop portion is formed around the body. At least part of the frame and at least part of the base plate are sandwiched between the flange portion and the stop portion. An annular boss is formed on a side of the flange portion farther away from the body. The sealing member fits around and abuts against the annular boss. The connecting member is configured to connect to the fastener so that the sealing member is sandwiched between the flange portion and the connecting member.