Product Description: Automatic Search and Lock Channel High Fidelity FM Radio; Use buttons to search for radio stations forward or backward; The volume can be adjusted using buttons; Adopting high fidelity digital power amplifier technology; Adopting? 50mm (4? X2W), full frequency internal magnetic horn, strong bass, and strong penetration; High pitched, pure and beautiful, transparent and delicate; Reserved? 3.5mm audio input interface, capable of connecting and playing music with audio devices such as mobile phones, iPhones, MP3, MP4 laptops, etc. It can be powered by 3 AA dry batteries or connected to a 5V DC power supply for long-term use.