Sets of 4 Silver Oxide watch batteries (by Maxell, Energizer or Renata) for Diesel Watch, 

2 analog, 1 light and 1 digital time zone,

with model number below:

DZ7206 and DZ7207

Optional tool set needed for battery change, which include:
- 1 Tweezers
- 1 Phillips Screwdriver
- 1 Flat Head Screwdriver
- 1 Jeweler's Loupe