Note: This flash is not compatible with ZV-1F, A9III, A99, A77, A350. This flash is not compatible with Rebel SL3, 250D, T7, 1500D, 2000D, T100, 3000D, 4000D, 200DII. This flash is not compatible with X-A3, X100F, X100T. Troubleshooting for failure to flash: When using the flash for the first time, wait for the flash recycle indicator to turn green, indicating recycle is complete. If the indicator remains red or white, replace the battery with a new or fully charged one. If the flash does not work, try going into the camera's menu and changing the flash setting to "manual mode / M". Troubleshooting for not working as expected: Shutter Speed setting: This flash does not have TTL function or high-speed sync. It is recommended to use a shutter speed below 1/200s; otherwise, photos may show black or white edges. Sensitivity setting: It is recommended to set the ISO sensitivity to 100, then adjust higher based on lighting conditions. Aperture setting: It is recommended to set the aperture to f/2.8, then adjust based on lighting conditions. Long-lasting Lithium Battery: Built-in 3.8V/470mAh lithium battery provides stable performance and delivers up to 440 full-power flashes with a recycle time of approximately 3 seconds. The iM20 features a USB-C charging port for fast recharging. Compact Design: The iM20 measures 1.54 x 1.5 x 1.16 inches and weighs only 31g, making it small and lightweight enough to fit in a pocket or handbag, ideal for street photography or travel. Compatible Mountings: Compatible with ZVE10, ZV1, A7III, GR3, GR3X, F1. Not compatible with ZV-1F. Camera Flash: Hot shoe Flash Sync Speed: 1/250s Product appearance and printed text may vary by batch, but this does not affect functionality. Color: Material: ABS Package Contents: 1 x iM20 Camera Flash Only the items listed above are included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.