The WHOOP 4.0 Charger in black is an original equipment manufacturer (OEM) unit designed specifically for the WHOOP activity tracker. This USB-C charger includes a puck only and is not compatible with the MG/5.0 model. Made for unisex adults who engage in running and jogging, the charger is designed to keep your activity tracker powered up and ready to track your fitness progress. With its sleek black color and English language compatibility, this WHOOP Charger 4.0 is a convenient and essential accessory for any fitness enthusiast.