Check the listing for details. Inner Balance Coherence Plus HeartMath HRV Sensor Bluetooth & USB-C Sensor. Color: Silver, Condition: Seller refurbished, Made in China. Listed at 129.99 USD. The Inner Balance Coherence Plus HeartMath HRV Sensor is a sophisticated electronic monitor that measures heart rate variability to promote better health and well-being. This unit, with a sleek silver color, includes Bluetooth connectivity for easy data transmission and analysis. The set includes the Inner Balance Coherence Plus device, perfect for monitoring heart rate variability in real-time. With the trusted HeartMath brand behind it, this product is designed to help users achieve optimal inner balance and coherence. *** sensor is in excellent condition but does have some minor mini scratches on the back clip. Not noticeable when worn and does not affect the use of the device. Rose Gold accents on side and back clip