Three consecutive tapping-tone sounds constitute the chime that is rung upon disembarkment from one of those buses, which is quite rare in Japan (the sound closely resembles the chime used in the JR East Series E233 train cars of the East Japan Railway Company).
降車チャイムの音は3打点で、全国的にみてもかなり珍しいものである（東日本旅客鉄道のJR東日本E233系電車のドアチャイムの音に酷似している）。