The Teenage Engineering OB‑4 Black is a portable high‑fidelity Bluetooth loudspeaker that delivers rich, open sound in a stylish matte black design. It supports multiple listening modes including Bluetooth streaming, FM radio, line‑in, and experimental disk mode for creative audio play. OB‑4 memorizes everything you play on an endless looping tape, letting you rewind, loop, and remix live audio with ease. A built‑in rechargeable battery offers up to 72 hours of FM radio listening and around 40 hours of Bluetooth playback on a single charge. Its compact yet robust build features a folding handle that doubles as a stand and extended antenna for enhanced reception. Four custom‑engineered speaker elements and a bass reflex design ensure deep, natural bass and clear stereo performance. The intuitive motorized interface includes tactile controls that respond to finger movement for volume and tape manipulation. With UV‑resistant paint and compatibility with the Ortho Remote and Orthoplay app, OB‑4 blends durability with modern connectivity. Whether at home, outdoors, or on the go, this speaker brings both form and function together. Its thoughtful engineering and playful features make it more than just a speaker – it’s an interactive audio experience.