A portable stereo cassette player, and it is currently the thinnest and most stable cassette player in production. It supports playing Type I to IV tapes. To ensure a stable movement, a customized large pure copper balance wheel with a diameter of 30.4 mm and a thickness of 4 mm was selected. Additionally, a high-voltage drive motor powered by 4.2 V is carefully chosen to maintain an extremely low oscillation rate. In the pursuit of superior quality magnetic heads, meticulous screening processes have been implemented to ensure stringent control over the entire production of CP13 magnetic heads. The aim is to minimize the disparity between the left and right channel. Featuring the renowned JRC5532 operational amplifier. 1800 mAh lithium cobalt oxide battery, providing over 13 hours of continuous playback for extended listening sessions.