SEIKO PROSPEX SBEF055 Ultra-Thin S690 Super Runners Solar Sports Watch

The Seiko Prospex SBEF055 is a slim and lightweight Super Runners digital sports watch engineered for runners and active lifestyles. Designed around Seiko’s S690 solar movement, this model charges from light and offers an extended battery life, making it ideal for long training sessions and everyday wear. Its ergonomic digital display and sports-oriented functions make it practical for timing, laps, world time, and alarms.

Key Features

• Super Runners Solar Design — built for runners and athletes who want a thin, lightweight sports watch with race-ready features.
• Solar-Powered Movement – Seiko Caliber S690 — charges from natural or artificial light; runs for approximately 6 months on full charge, and up to ~20 months in power-save mode.
• Large Digital Display — easy-to-read information layout optimized for quick glances mid-run.
• Lap Memory (up to 300) — ideal for tracking performance over multiple segments.
• Stopwatch (1/100 sec, up to 100 hrs) — precise timing for training and races.
• World Time (44 Cities) — handy for travel or international meetups.
• Timers & Alarms — daily alarms with 3 channels plus countdown timer.
• Full Auto Calendar (to Dec 2100) — no manual adjustments needed through 2100.
• EL Backlight (Tap Activation) — easy illumination in low light.

Specifications

• Model: SBEF055
• Series: Seiko Prospex Super Runners
• Movement: Solar Quartz – Caliber S690
• Accuracy: ±20 seconds per month (typical)
• Power Reserve: Approx. 6 months full charge; up to ~20 months with power-save
• Display: Digital LCD
• Functions:
• Time
• Stopwatch (1/100 sec up to 100 hrs)
• Lap memory (up to 300)
• Timer
• World time (44 cities)
• Daily alarms (3 channels)
• Full auto calendar
• Power reserve indicator
• Battery level indicator
• Sound demo mode
• EL backlight (tap)

Case & Strap

• Case Material: Plastic (stainless steel caseback)
• Crystal: Hardlex glass
• Strap Material: Polyurethane
• Case Dimensions:
• Diameter: Approx. 43.7 mm
• Height: Approx. 45.0 mm
• Thickness: Approx. 8.5 mm
• Lug Width: Approx. 18 mm
• Water Resistance: 10 bar / 100 m — safe for swimming, rain, and everyday water exposure.
• Weight: Approx. 41 g (lightweight for sports use)

Colorway:

• Case / Strap: Black polyurethane
• Display: Black digital LCD with high contrast

The Seiko Prospex SBEF055 Ultra-Thin S690 Super Runners Solar Sports Watch is a purpose-built digital sports timepiece that delivers reliable solar power, performance-oriented timing functions, and lightweight comfort. Its broad set of features — including lap memory, world time, alarms, and durable daily water resistance — make it a strong choice for runners, athletes, and anyone with an active lifestyle.