Wireless remote control off-camera flash on-board flash, as long as the digital camera has a hot shoe, you can off-camera on-board flash from three mainstream Special one-color design, with 16-channel frequency modulation, 30-meter long-distance trigger, strong anti-interference ability Low voltage (5V-12V) trigger, sensitive response, no stroboscopic, leakage and other undesirable phenomena Suitable for professional photographers and photographers who often use top-mounted flash; mainly used for different of on-board flashes to achieve off-camera flash, which is convenient for photographers to fill light Specification: Material: ABS Transmitter battery: 23A-12V battery (built-in), can be used up to 10,000 times Outdoor remote control distance: 30m/98.4ft Indoor remote control distance: 25m/82ft Channel: 16 channels Frequency: 433Mhz Maximum synchronization speed: 1/250S The product appearance and printed words depending on the batch, but this does not affect use Color: As Shown Package Contents: 1 x Radio Wireless Remote 1 x Flash Synchronizer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.