The smallest and lightest charger and on-camera power supply, the Tandem 150 Modular Power System operates as a DC power supply once a camera or other device is connected and turned on. This unique system functions by separating the Gold Mount device from the power supply, allowing a user to simultaneously charge a battery and power a camera. When a 75 watt draw is exceeded, the system automatically stops charging and performs soley as a 150 watt power supply. When the camera is turned off or the load is reduced below 75 watts, the Tandem 150 system instantly resumes normal operation as a simultaneous charger/power supply. The Tandem 150 consists of the QR-TM and PSU-150.