Abstract: A buffering device includes a cylindrical casing and a piston module movably mounted in the cylindrical casing. The cylindrical casing includes a base plate and a shielding piece pivotally attached to the base plate. An air inlet and an air outlet are defined in the base plate. A diameter of the air inlet is greater than that of the air outlet. When the piston module is moving towards the base plate, the shielding piece is rotated to a closed position to shield the air inlet by air pressure above the shielding piece. When the piston module is moving away from the base plate, the shielding piece is rotated to an open position to expose the air inlet by environmental air pressure.

Abstract: A water level detection device includes a case, a detection assembly, and a latching ring secured to the case. The detection assembly includes a warning module, a micro switch, a cable, and a floater. The cable is inserted through the latching ring and divided to a first section connected to the micro switch and a second section connected to the floater. When a water level is in an upper limit or a lower limit, the second section is tight, and an angle is defined between the second section and the first section. When the water level is between the upper and the lower limit, the second section is loose. When the water level is over the upper limit or under the lower limit, the floater pulls the first section via the second section to trigger the micro switch to alarm the warning module.