The bell and whistle is simple equipment. The bell can set off an alarm, and the whistle allows alerting comrades at a distance. [MME:124] * Price: 1 gp In other editions, these items were separate. In 3.5e, the bell was 1 gp, and the whistle is 8 sp. In 5e, the bell is 1 gp, and the whistle is 5 cp. There is no specific rule for how they operate, but can be treated as making a loud noise (Perception DC 0 or -5) if used.