With the Relay Camera Coupler, you can seamlessly power your camera with an external 5V USB battery pack or wall power, making it an essential tool for photographers and videographers. This compact and portable device works in conjunction with the Case Relay Camera Power System, transforming your camera battery cavity into a power conduit.The Relay Camera Coupler is not a battery and does not hold a charge. Instead, it serves as a reliable connector, enabling continuous power supply to your camera from an external source. When paired with the Case Relay Camera Power System, it delivers constant, uninterrupted power, making it an ideal solution for time-lapse photography, photo booths, video production, and power-intensive LiveView shooting.For those long days on set or in the field, the Relay Camera Coupler ensures your camera never runs out of power. If you need more power, simply hot swap in another power bank and continue shooting without any interruption or loss of power to your camera.The Relay Camera Coupler is easy to use. Simply insert it directly into the camera battery port, attach it to the Case Relay CPS, and power your camera with the included Rock Solid External Battery Pack or an AC power source using a USB to AC wall adapter. Alternatively, you can use the ONsite D-Tap Battery with V-Mount. The Case Relay also features a secondary internal 1200 mAh battery, providing a safety net if your external battery runs low. This allows you to easily swap the external battery without losing power to your camera.In summary, the Relay Camera Coupler is a durable, high-quality device that offers compatibility with a wide range of cameras and devices. It's a versatile solution for users who need to power multiple devices, ensuring reliable, continuous power for your camera.