It appears there might be a mix-up with the product code provided. REN-H47BK actually corresponds to the RENEE Midnight Kohl Pencil, a popular waterproof eye makeup product

However, if you are strictly searching for a reliable medical-grade finger pulse oximeter manufactured by BMC Medical, the brand offers highly rated health monitoring models instead:

🩺 Recommended BMC Finger Pulse Oximeters

BMC Pulse Oximeter M130:
Best For: General hospital and everyday home monitoring.

Key Features: Features a clear, dual-color OLED display with 4 multi-directional views, automated power conservation, and a soft silicone chamber designed to reduce structural pressure on fingers

BMC Pulse Oximeter CMS50D:
Best For: Budget-friendly comprehensive tracking.

Key Features: Compact 50g unit equipped with a high-resolution screen that displays real-time SpO2, pulse rate, perfusion index graphs, and low-battery alerts