Casio: G Shock Digital Multi Function Watch Features:200M Water Resistant, Interchangeable Band Structure 7 Year Battery Life Specifications: Accuracy: ±15 seconds per month, Approx. battery life: 7 years on CR2016 Module: 5637,
How to Change a G-SHOCK Watch Battery - YouTube
Men's Casio G-Shock G-Steel Watch with Black Dial (Model: GSTB400D-1A) | Zales