100% SLENDALE SL Soft Tact Grey HiPER Copper Mirror R0 ultra fast shifting and a no sacrifice Elevate your cycling experience ultra fast shifting and a no sacrifice 500% gear range light stays on for 3 seconds): Green ＞60% Blue 30%–60% Yellow 10%–30% Red ＜10%Heart Rate Zone Indicator (flashes during exercise to show current zone): White Warm up Blue Fat burning zone Green Aerobic endurance Yellow Threshold zone Red Anaerobic enduranceSound Alerts (Buzzer): Supports heart rate alerts and status remindersAuto Sleep Condition: Automatically enters sleep mode after no heart rate data and no Bluetooth connection for a set durationMaintenance Instructions: Rinse with clean waterChest Strap Length: Medium (75–100 cm) Mfr Claimed Weight the smaller scale Slendale SL is specifically designed for smaller faces