Jaeger-lecoultre, Extreme Master, Model: Q204C470, limited to 500 pieces worldwide. Limited dial diameter: 44mm, black matte ceramic case (Ceramic is hard but brittle, and there is a risk of chipping when bumped) • Movement: Self-produced Cal.751 automatic chronograph movement, 65-hour power reserve, solid case back design • Dial: Black, large luminous 12 / 6 digital hour markers; The small left dial is an 8-hour chronograph sub-dial (marked "HRS"), and the right one is a 30-minute chronograph. Central red chronograph second hand; 4 o 'clock position calendar window The iconic "compression lock" crown with red details and chronograph pushers • Strap: Original black background with red stitching canvas / composite material strap, with pin buckle • Waterproof: 100 meters (Sporty style, much better waterproof than the formal master)