Open box. No box or docs. The Douk Audio P1 GE5725 Tube Preamp Bluetooth Receiver USB DAC Headphone is a high-quality Hi-Fi amplifier designed for home audio systems. It features a sleek black design and offers two audio outputs - a headphone jack and stereo L/R RCA outputs. With Bluetooth and USB audio inputs, this unit allows for versatile connectivity options. The analog and digital features make it suitable for a range of audio needs, while its two channels provide a clear and immersive listening experience. Made in China, this amplifier is a reliable choice for enhancing your home audio setup.