CASIO G-SHOCK GM-100D Watch Features G'MIX sound function. Battery replaced and waterproof function checked at the Shibuya G-Shock Store on October 26, 2025 (cost: 3,800 yen). When the sound switch is turned on, a "piko-piko" musical tune plays and a character dances. It can be worn over clothing with Velcro and a buckle. I think it's a fairly rare model. - Model Name: GM-100D-8JF - Brand: G-SHOCK - Color: Silver/Black - Functions: Auto light switch, Water resistant - Backlight: LED backlight Thank you for viewing. Accessories: None Operation: Good