1. In addition to the main volume / treble / bass controls, there is also a specially designed bass volume control for easy enjoyment of high-quality music. 2. Bass & Treble & Volume Adjustment: Power switch button with clear response and rotary knob control for main volume adjustment. It can be adjusted according to your needs. 3. Compact size: Complete design and exquisite appearance, matte silver shell looks stylish and durable, unique structural design is easy to install on cars/ships, saves space and is easy to operate. 4. Application range: DC 12V input is suitable for many scenes, can be used in your car, your boat, your RV, your golf cart, your home, anywhere you need a great amplifier, low distortion and acoustic accurate music reproduction. Name: Car Audio Number of channels: 2.1 Power amplifier type: HIFI power amplifier Audio input: Stereo L/R RCA / 3.5mm AUX Audio output: wire control speaker jack + subwoofer Bluetooth-compatible: not supported Input voltage: DC 12V/2A Effective power: 20WX2+40W Maximum power: 200W+200W Channels: 2.1 power amplifier, can connect 2 speakers and a subwoofer Speaker impedance: 4-8ohm; Frequency response: 20Hz-20KHz Distortion: 0.004 Signal to noise ratio: 80dB Resolution: 47K Working voltage: DC 12V Dimensions (L x W x H): 150 x 92 x 34mm / 5.91 x 3.62 x 1.34in Different batches may have different factory appearance labels, which will not affect the use Colour:silver Material:Metal Package Contents: 1 x Car Stereo Amplifier Speaker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.