This RL2512JK-070R27L current sense resistor is a surface-mount device (SMD) manufactured by Yageo. It has a 0.27 Ohm rating and a 5% tolerance, and is rated for 1 Watt of power. The device is designed to sense and monitor current flow, and provides feedback on the current running through a circuit. It is commonly used in power devices, and is designed to be resilient against frequency change, heat shock, vibration, and other external factors.