The WATTSTUNDE® MC4 to MC4 cable (50 cm) is an ultra-thin, highly flexible photovoltaic cable that allows solar energy to be routed through windows, doors, and narrow gaps without the need for drilling. Suitable for use in caravans, RVs, balconies, and rental properties, this flat cable fits comfortably in closed window frames, vehicle doors, and narrow openings. It is equipped with weather-resistant, compatible MC4 male and female connectors at both ends, providing a secure, low-loss electrical bridge between external solar panels and internal power stations or charge controllers.