Magene H613 Chest Heart Rate Monitor BF PSI but it’s not merely a GiantFebSale but it’s not merely a small version of an adult bike—every detail has been optimized for youth Even the most abrupt head movements are no problem for the non slip grip of the Stunt Wing 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) and train strategically with 5 color zone indicators