This is a Cosmo Series Wide 21 recessed electronic ventilation switch set, model WTC53946, manufactured by Panasonic Matsushita Electric Works. It is a combined switch for lighting, ventilation timer, and ventilation. It features a "hotaru" (firefly) switch B, which illuminates when each switch is OFF, making it easier to operate in the dark. It has a timer function with settings for 4 hours, 2 hours, and continuous operation after the switch is turned ON. Rated for 5-50W, 100V AC, 50/60Hz.