Alarm Monkey

The Alarm Monkey is a minor character that is often seen swinging a bell.

Mario's Bombs Away
The Alarm Monkey first appears in Mario's Bombs Away, where, although he is not directly involved in gameplay, he appears as an alarm indicator by swinging a bell.

Game & Watch Gallery 4
The Alarm Monkey reappears in Game & Watch Gallery 4, where, as the Game & Watch Gallery series does not recreate the alarm feature of the original Game & Watch games, the Alarm Monkey is not an alarm indicator although he appears in the game's credits in its starting sequence, where he is seen swinging a bell.

Trivia

 * In Parachute, there is a different alarm monkey with a different appearance.