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Limited access to affordable medical devices remains a challenge, particularly in resource-limited areas. Devices such as vein finders and pulse oximeters are generally expensive, while electronic waste, including used computer mice, continues to increase and is not optimally utilized. A used computer mouse was selected due to its compact size, ergonomic shape, and comfortable grip, making it suitable as a portable device casing. Its material is durable and easy to disassemble. Red LEDs are installed on the upper surface to assist in vein detection, while the internal space accommodates the battery and electronic circuits without requiring a new casing. A display is mounted on the bottom, and the sensor is placed in the optical opening. Additionally, used mice are widely available and inexpensive, supporting the concept of low-cost medical devices while reducing electronic waste. This study aims to design and develop a low-cost medical device based on a recycled computer mouse to detect veins on the back of the hand and measure heart rate and blood oxygen saturation (SpO2).  A prototype-based design approach was employed. The device integrates a MAX30100 sensor for heart rate and SpO2 measurement, an OLED SSD1306 I2C display for data visualization, red piranha LEDs for vein visualization, and an LM7805 voltage regulator. Experimental testing was conducted on several subjects, and the results were compared with standard instruments using descriptive analysis. The results show that the device can display heart rate and SpO2 values in real time with acceptable tolerance. Vein detection was successfully visualized using red LED illumination, and the fabrication cost was significantly lower than that of commercial devices. In conclusion, the device meets its objective as a simple, multifunctional, and low-cost medical tool, with strong potential for use in resource-limited settings.