CR2032 Battery. Commonly used in optics like red dots and scopes with illuminated reticles
TA5C 5 Pack CR2032 Batteries Lithium 3V Batteries Button Cell Universal for Tuners - AliExpress
GUARANTEED TO LAST FOR 5 YEARS OR YOUR MONEY BACK — We all know how frustrating it can be when our favorite tools don't work. No more setbacks! AmVolt
15 Pack CR2032 Batteries - [Extended Life] Airtag Battery 220mAh 3 Volt Lithium Replacement Airbag 3v C2032 Watch Battery Coin Round Button Cell - Key
Red Dot Sights Airgun 101 Shop – Airgun101 Shop
Batteries - Airguns Europe
CR2032 Lithium Button Coin Cell 2032 Battery Compatible with AirTag Key FOBs calculators Coin counters Watches etc 2-40pcs - AliExpress
Best Red Dot for GLOCK 19 MOS Pistols
Red Dot Sight, Manufacturer : C-More (USA), Model : RTS2B V5, Dot Size : 6 MOA, Color : Black TargetZone