1. Normal version, output power 2x1W, 8 ohm load, no external power supply, with DC volume adjustment potentiometer and power switch, work indicator LED, high-end LM4866MT as power amplifier. Low-voltage SWA cable is a kind of cable used for underground installation, outdoor lighting and other low-voltage applications. Low Voltage SWA Armored Cable,SWA Armored Cable,Copper Sheathed Power Cable,Low Voltage XLPE Power Cable Ruitian Cable CO.,LTD. , https://www.hbruitiancable.com
2. HI-FI level USB AUDIO PCB, using high-quality USB AUDIO DAC chip, using two OPA604 to build LPF, pushing LM4766 to output 2x40W power. The three parts of the power supply are filtered by independent AC-DC rectification. 
SWA Armored Cable has a layer of steel wire armor, which provides mechanical protection, and is used for laying directly buried cables or ordinary pipes, ordinary ground, tunnels, etc. The steel wire armor can withstand the general longitudinal tension, so it is suitable for short distance overhead laying or vertical and vertical laying, which is helpful to prevent the injury of rodents and other animals.
The cable is also insulated with PVC (polyvinyl chloride) or XLPE (cross-linked polyethylene) to prevent electrical failure and damage caused by moisture and other environmental factors. Low-voltage SWA armored cables have various sizes and configurations to adapt to different applications and are suitable for residential and commercial environments.