The 30” long regulated Tri-Tap to Sony NP-FW50 Dummy Battery Cable provides power to an optional Sony a7 series camera from an optional device or battery with a D-Tap connector. The cable is regulated to provide the correct voltage to your camera, and in addition, the in-line voltage regulator helps prevent electrical noise from being introduced into your camera. There is also a USB port that outputs 5 volts of power at up to 2 amps, enabling it to power most USB devices on set, including smartphones and some tablets. Also, a female D-tap output is also offered, so you can still power you D-tap accessories while using the D-USB and power out cable. Made in the USA.