The Jaeger-LeCoultre Master Compressor Memovox in 18k rose gold is a highly collectible luxury sports watch that successfully bridges the gap between high-end horology and utilitarian tool watch design. Launched in 2002 and discontinued around 2007, this line is famous for its mechanical alarm function and revolutionary compression key crown system.

• The Mechanical Alarm: The signature Memovox alarm relies on a hanging gong mechanism that produces a loud, clear, and sustained mechanical ring rather than a simple buzz. Winding and adjusting the alarm is operated via the top-right crown. 

• Compressor Crowns: Unlike traditional screw-down crowns, JLC’s proprietary wing-nut compressor keys only require a half-turn to lock or unlock. Color-coded arrows serve as safety indicators: Red arrows indicate the crown is open, while White arrows confirm the system is locked secure and water-resistant. 

• Internal Rotating Bezel: Used for tracking elapsed time, this internal dive bezel sits securely beneath the sapphire crystal and is operated by the dedicated crown located at the 10 o'clock position.

• Reference Numbers: Q1702440 (or case reference 146.2.97 / 170.24.40).

• Case Size: 41.5 mm diameter and a substantial 15.2 mm to 15.5 mm thickness.

• Case Material: Solid 18k Rose Gold (Pink Gold) featuring a solid caseback with a rose gold "Master 1,000 Hours" medallion.

• Dial: High-contrast Anthracite Grey or Black base featuring applied rose gold luminescent hour markers and matching hands.

• Movement: In-house JLC Caliber 918, an automatic movement operating at 4Hz with a 45-hour power reserve. It uses a separate barrel to power the alarm mechanism.

• Water Resistance: 100 meters (10 ATM), making it a robust, light-duty dive watch.