Audible end cap and handheld metal detector

An audible end cap, comprising:

• a waterproof loudspeaker, for generating multiple alarm sound combinations, wherein the diameter of the waterproof loudspeaker is greater than 2 cm;
• a back cover provided with a first connecting portion whereby the back cover is capable of being fixedly installed on a metal detector, wherein the waterproof loudspeaker is installed in the back cover;
• an audio connector electrically connected to the waterproof loudspeaker, wherein the waterproof loudspeaker is capable of receiving and emitting the sound signal output by the metal detector through the electrical connection between the metal detector and the audio connector;
• wherein the audible end cap further comprises a protective collar, a first protective bracket, and a second protective bracket, wherein the waterproof loudspeaker is fixedly clamped between the first protective bracket and the second protective bracket,
• wherein the protective collar is fixedly installed in the back cover and is sleeved and fixed on the outer periphery of the first protective bracket and the second protective bracket,
• and wherein the first protective bracket, the second protective bracket and the waterproof loudspeaker are all contained in the back cover.