Junk Item for Sale Black wearable device with a heart rate sensor and magnetic charging. - Color: Black - Charging Method: Magnetic charging - Sensor: Heart rate sensor - Size: Free size The built-in battery has likely deteriorated, resulting in slow charging and rapid battery drain. I purchased and used this about 7 years ago for vitality. I used it for step tracking, calorie management, and sleep tracking. It shows signs of wear and tear from many years of use. Thank you for looking.