Note: This flash NOT compatible with ZV-1F, A9III, A99, A77, A350. This flash NOT compatible with Rebel SL3, 250D, T7, 1500D, 2000D, T100, 3000D, 4000D, 200DII. This flash NOT compatible with X-A3, X100F, X100TTroubleshooting for failure to flash: 1. When using the flash for the first time, wait for the flash recycle indicator to turn green, it means recycle complete. If it the indicator remains red or white, please replace the battery with a new one or a fully oneIf the flash can't work, try going into the camera's menu and changing the flash setting to to "manual mode / M" mode Troubleshooting for not working as expected: 1. Shutter Speed setting: this flash doesn't has TTL function or High-speed sync, we recommend a shutter speed below 1/200, otherwise, the photos may show black edges, white edges issues. 2. Sensitivity setting: we recommend setting the ISO sensitivity to 100, and then increasing it based on the actual brightness or darkness.Aperture setting: we recommend setting the aperture to 2.8, and then increasing it based on the actual brightness or darkness. Long-lasting Lithium Battery: Built-in a 3.8V/470mAh lithium battery, the iM20 offers stable performance and can deliver up to 440 full-power flashes, with a recycle time of about 3 seconds. The iM20 comes with a USB C charging port, enabling rapid recharging and keeping you prepared forand Compact: the iM20 only size of 1.54 x 1.5 x 1.16 inches and 31g weight, iM20 fits in your pocket or handbag without taking up much space, making it easy to carry around for street photography or travel:Compatible Mountings:for zve10,zv1,a7iii/ gr3,gr3x/ f1, NOT for ZV-1FCamera Flash:HotshoeFlash Sync Speed:1/250sThe product appearance and printed words depending on the batch, but this does not affect useColor:Material: ABSPackage Contents:1 x iM20 Camera FlashOnly 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.