NPU adaptors have been designed to be used with the battery standing on its end with the adaptor on top. This gives easy access to the two featured switches and LED indicator. The NPU has fully regulated outputs, a voltage selector switch allows the user to select between either 9 or 12 volts, depending on specific equipment being powered.

The NPU-SQN4S has four switched Hirose sockets and a Hirose(SQN) flying lead.