Passive Volume Controller: This volume controller features one pair of RCA interfaces for input and output, offering a simple, plug-and-play setup that requires no external power supply. Premium Material: Constructed from all-metal material with fine craftsmanship, this passive volume controller provides durability, anti-interference performance, and rust resistance. Stable Performance: Designed for stable signal transmission, this passive preamp delivers clear and pure audio output, suitable for home audio systems or professional recording studio applications. Compact and Portable: Measuring approximately 16.7 x 6.8 x 4.9 cm (6.57 x 2.68 x 1.93 in), this volume controller is compact and lightweight for convenient use in various settings. Lossless Output Design: Engineered for smooth and transparent sound quality, this passive preamp ensures high-fidelity, lossless audio performance. Package Includes: 1 x Passive Volume Controller, 1 x Instruction Manual Item Type: Passive Volume Controller Material: Metal Features: High precision, minimal signal loss, low accuracy error, clean audio output