Abstract: A monitor for monitoring the conditions of and around and under a manhole cover senses current conditions of the manhole cover and enables wireless self-reporting of such conditions at intervals and upon certain emergency situations arising. The monitor of the manhole cover includes a shell, a cover plate, and a base. The cover plate is detachably assembled with the shell. The base connects the shell with the manhole cover. The base includes a magnet to which the manhole cover is strongly attracted. The monitor is held to the manhole cover by the magnet. A mounting operation of the monitor is simple, requiring only placement by hand, and a mounting time is saved.

Abstract: A housing assembly for an electronic device, which allows the installation of a larger and more powerful battery includes a first housing and a second housing. The second housing is received in the first housing. A groove is formed on a surface of the first housing facing the second housing. The second housing includes a first side plate, a second side plate facing to the first side plate, a bottom plate, and a fastener. The first side plate and the second side plate are disposed on sides of the bottom plate to form a receiving space. The first side plate and the second side plate are connected to the first housing. The fastener is disposed on the first side plate or the second side plate, and received in the groove. An electronic device using the housing assembly is also provided.

Abstract: A housing assembly for an electronic device, which allows the installation of a larger and more powerful battery includes a first housing and a second housing. The second housing is received in the first housing. A groove is formed on a surface of the first housing facing the second housing. The second housing includes a first side plate, a second side plate facing to the first side plate, a bottom plate, and a fastener. The first side plate and the second side plate are disposed on sides of the bottom plate to form a receiving space. The first side plate and the second side plate are connected to the first housing. The fastener is disposed on the first side plate or the second side plate, and received in the groove. An electronic device using the housing assembly is also provided.

Abstract: A waterproof button for an electronic device includes a button portion and a waterproof portion. The button portion includes an operating portion, a connecting portion, and a pressing portion. The waterproof portion includes a positioning portion, a sleeve, and a receiving portion. The positioning portion defines a through hole to allow the connecting portion to pass through. The sleeve is connected to the positioning portion to receive the connecting portion, the receiving portion is connected to the sleeve to receive the pressing portion. A surface of the positioning portion forms a fixing surface. When the waterproof button is mounted to the electronic device, the fixing surface is fixed to the electronic device. An electronic device using the waterproof button is also described.

Abstract: A waterproof button for an electronic device includes a button portion and a waterproof portion. The button portion includes an operating portion, a connecting portion, and a pressing portion. The waterproof portion includes a positioning portion, a sleeve, and a receiving portion. The positioning portion defines a through hole to allow the connecting portion to pass through. The sleeve is connected to the positioning portion to receive the connecting portion, the receiving portion is connected to the sleeve to receive the pressing portion. A surface of the positioning portion forms a fixing surface. When the waterproof button is mounted to the electronic device, the fixing surface is fixed to the electronic device. An electronic device using the waterproof button is also described.