Use this flash trigger to enable the master flash to control an auxiliary flash 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 (not compatible with Canon flashes). This slave trigger is not suitable for Minolta, Sony, or Canon flashes. The Wireless Hot Shoe Flash Remote Slave Trigger operates on optical sensing technology, allowing synchronized wireless flash triggering. It is compact, well-designed, highly flexible, and delivers stable performance. It can be used to create various lighting effects manually. Material: ABS + metal. Package includes: 1 x Wireless Hot Shoe Flash Remote Slave Trigger. Other items not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.