This BKN product is a Pure copper probe with rapid and stable conduction , Flexible PVC cable(Easy to roll and convenient for storage) , and Durable PTC (Power Protection Inside) to keep your watch safe from over-current or over-charging when connected it power source, and cradle design, feel more comfortable and safe with humanization design for use, Easy to use:-just plug your compatible Magnetic 2 Pin Smart Watch to the charging station and then connect the USB to PC or AC charger to get your watch charged