Features: Brand new and high quality High performance digital power amplifier chip TPA3116D2 is the core of this product, which supports 100W (low frequency channel) output and has a wide working voltage range. The product is made of ABS material and has an energy saving design with an efficiency of up to 90% or more. This product is suitable for people who need high quality audio playback and can be used with a variety of power sources such as switch power supplies, laptop switch power supplies, charging batteries or car power supplies. This product is ideal for use in home theaters, outdoor activities, and other scenarios that require high quality audio playback. With external audio input interface, front end amplification, low frequency division processing low frequency volume, low frequency frequency, switch/total volume, 2 adjustment potentiometers. Specifications: Model Number: ZK-502C Operating Temperature: -40-+85 Dissipation Power: 50Wx2 Bluetooth: 5.0 Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Digital Power Audio Amplifier Board