of these items will function for their intended uses a uniqueness of this water resistant case 10 is that alarm hole 21 provided in the same location as that of the buzzer on the portable receiver is tightly closed by a waterproof sheet 21a that allows the air to get through but not a drop of water consequently the case does not change the volume of the buzzer and has the needed water proof effect the methods of how hole 21 light display window 20 and button 22 are installed and structured is as follows holes to place light display window 20 hole 21 and button 22 are provided in preferably an indented section 19 of the right side case portion 25 of the water resistant case 10 an external button 22 is made of silicone rubber or the like that protrudes from outside the case portion 25 when placed in the hole for a user to press and depress a matching switch not shown on the portable receiver 30 covered by water resistant case 10 to attach the button 22 to the outside case portion 25 a collar 25a is defined around at least a portion of the periphery of the button 22 this collar 25a is slightly larger than the hole in which the button 22 is to be placed parts of the case 25 may be indented to fit these collars to match the height of.