Ronstan ClearStart™ 50mm Sailing Watch — Black/Grey (RF4055A)

World Sailing Race Timer. Mineral Crystal Lens. 5 ATM Water Resistant. Built for Racing Sailors.

The Ronstan ClearStart™ RF4055A is a 50mm race sailing watch developed with input from top-level sailors and designed specifically for competitive racing. A mineral crystal lens (upgraded from acrylic) is recessed in a glass-reinforced polycarbonate case for improved clarity and impact resistance. The flexible injection-molded silicone band provides all-day comfort and durability. Large, low-profile textured buttons and an easy-to-read display make operation simple in race conditions. Water resistant to 5 ATM (50m/150ft).

Note: This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

General Features

• Mineral crystal lens — recessed in case for improved impact resistance
• Glass-reinforced polycarbonate case
• Flexible injection-molded silicone band
• Low-profile textured “easy-find” buttons
• Time display: hours/minutes/seconds — 12 or 24-hour format
• Date display: month/day or day/month format
• Daily alarm
• Chronograph (including elapsed hours and time of day)
• Luminescent backlight with battery-saving mode
• Shock resistant
• Water resistant to 5 ATM (50m/150ft)

Race Mode Features

• Multiple start sequence options — World Sailing 5-4-1-0, match racing, user-set
• SYNC function — resynchronize countdown if started late
• Multi-line display: start sequence + time of day
• Loud countdown and start sound signals
• Countdown repeat, or count down then up (for elapsed race time)
• Separate fast-access race and time mode scrolling

Specifications

• Case Size: 50mm (2")
• Color: Black/Grey
• Lens: Mineral crystal, recessed
• Case Material: Glass-reinforced polycarbonate
• Band: Injection-molded silicone
• Water Resistance: 5 ATM (50m/150ft)
• Box Dimensions: 3"H × 3"W × 5"L | 0.2 lbs
• UPC: 9316800574605

Download Quick Guide (PDF)