CASTOR doubles up as your home radio. You can also enjoy your personal collection of songs by plugging in a USB drive or streaming songs from your SD card. It works on a rechargeable battery that lasts up to 8 hours. The product is backed by an all India service network, providing 12 months in-home warranty support. Each Channel can be selected by turning a jog-dial. So literally, with a simple turn of the knob you can receive 3 Band.