The Rosewill RD400-2SB 400W BTX Power Supply PSU is a non-modular power supply unit designed for ATX12V motherboards. With a maximum power output of 400W and cooling via a single fan, this black power supply is compatible with both 115V and 230V systems. It features 24 pin connectors and a compact BTX form factor, making it suitable for various computer setups. The Rosewill brand is known for quality and reliability, ensuring stable performance for your system.