The RC 4/36 is a powerful job-site radio charger, which not only plays music but also recharges lithium-ion batteries of various sizes. The charger can be connected to a wide variety of devices like smartphones using Bluetooth or the USB port. The black rubberised edges make the charger particularly robust by providing impact protection, and both speakers are shielded by strong metal grilles. The unit can play music using either mains or battery power.