Features: Especially suitable for watching movies in 3D effect is for stronger. It is safe to use, durable. Lightweight and portable to taken outside. It is the best replacement for your old,broken one. High-quality and cost-effective exquisite components from leading manufacturers. Specifications: Product name: Pre-stage tuning board Power supply voltage: DC12V-24V for DC Number of channels: two channels Product weight: 52 grams Product size: 96*39*16MM Installation hole distance: 89.3*32.3MM Product introduction: XR-A901 preamp tone board, suitable for use with power amplifier, can achieve audio amplification and high, medium and adjustment; let you have a better listening experience; it uses dual-core NE5532 original imported chip. The power supply voltage is for DC DC12-24V When wiring, distinguish the positive and negative of the power supply. The audio input is a 3P audio cable Note: When wiring, distinguish the positive and negative of the power supply. The audio input is a 3P audio cable Package includes: 1 x XH-A901 NE5532 tone board 1 x 3P audio cable