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, X100T Troubleshooting 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 one or a fully one If 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 p os 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 for and 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 p ography or travel : Compatible Mountings:for zve10,zv1,a7iii/ gr3,gr3x/ f1, NOT for ZV-1F Camera Flash: shoe Flash Sync Speed:1/250s The product appearance and printed words depending on the batch, but this does not affect use Color: As Shown Material: ABS Package Contents: 1 x iM20 Camera Flash <br