You can look no further than this Wireless Audio Module that has been designed for use with metal detector models CTX3030 and GPZ 7000 to make it easier to locate treasures.
Accessories of GPZ 7000
An extensive selection of accessories is available to further boost the efficiency of your Minelab detector. These accessories are intended to add flexibility to your detectors when you need to adjust to different detecting conditions. Genuine Minelab accessories, from cables to coils, are designed to provide maximum performance and are thus provided with a global Minelab warranty.