Use this flash trigger to enable the master flash to control an auxiliary flash unit remotely and synchronously without connecting wires. It senses light from the master flash to trigger the slave flash wirelessly. Compatible with most flash units using ISO universal hot shoe, such as Nikon, Sigma, Olympus, and Pentax. This slave trigger is not suitable for Minolta or Canon flash units. The Wireless Hot Shoe Flash Remote Slave Trigger operates on optical sensing technology, allowing the master flash to control the auxiliary flash remotely and synchronously without cables. It is compact in size, features a sleek design, offers high flexibility, and delivers stable performance. It can also be used to create various lighting effects manually. Material: ABS + metal. Package Contents: 1 x Wireless Hot Shoe Flash Remote Slave Trigger. Note: The package includes only the item listed above; other products are not included. Due to lighting and display differences, the color of the item in the image may vary slightly from the actual product. Measurement may vary by +/- 1-3 cm.