Fiio has designed their cassette player cp13 with large oval buttons for playback controls play, stop, rewind, fast forward on one side, while down the other side, you will find a sleek volume dial, a usb c port for charging, a 3.5mm headphone input and a status led. Full analog circuit, 100% pure analog sound to authentically reproduce analogue signals, cp13 employs analogue devices from signal collection to amplification, creating a fully analogue circuit that faithfully reproduces classic analogue sound. Classic reproduction, audiophile op amp jrc5532 cp13 incorporates the imported audiophile op amp jrc5532, a classic reproduction known as the king of op amps. Coupled with the all analogue circuit processing, it delivers familiar melodies with a lingering and nuanced sound. Fusion of form and function, dual tone full aluminium alloy casing crafted meticulously with full aluminium alloy, cp13's dual tone casing showcases a seamless blend of form and function, with a zero visible screws design, enhancing both texture and aesthetics. Additionally, the buttons use a tough oxidation process, ensuring durability and corrosion resistance. The aluminium alloy volume knob features a large sized analogue volume potentiometer, offering better stability, reliability, and an improved adjustment feel compared to regular cassette players using flatter potentiometers. Long lasting battery life, 13 hours of continuous playback cp13 features a high capacity 1800mah lithium battery, providing more power and a longer lifespan, offering over 13 hours of continuous playback and an outstanding standby time of over 268 days. Dual mode power supply, uninterrupted enjoyment cp13 is equipped with a dual mode power supply design, supporting both battery and type c charging. Connecting to a 5v power adapter enables charging, with mature charging, power supply, and overvoltage protection circuits for added peace of mind. More colour options to be released later on