Note: This flash is not compatible with ZV-1F, A9III, A77, A350, Rebel SL3, 250D, T7, 1500D, 2000D, T100, 3000D, 4000D, 200DII, 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, access the camera’s menu and set the flash mode to "Manual (M)." Troubleshooting for performance issues: 1. Shutter Speed: This flash does not support TTL or high-speed sync. Use a shutter speed of 1/200s or slower to avoid black or white edges in images. 2. ISO Sensitivity: Start with ISO 100 and adjust higher based on lighting conditions. 3. Aperture: Begin with an aperture of f/2.8 and adjust according to scene brightness. Long-Lasting Lithium Battery: Built-in 3.8V/470mAh rechargeable lithium battery provides up to 440 full-power flashes with approximately 3 seconds recycle time. Equipped with USB-C charging port for fast and convenient recharging. Compact Design: Measures 1.54 x 1.5 x 1.16 inches and weighs only 31g. Its small size allows easy storage in pockets or bags, ideal for travel and street photography. Compatible Mountings: Compatible with ZVE10, ZV1, A7III, GR3, GR3X, F1. Not compatible with ZV-1F. Camera Flash Type: Hot shoe Flash Sync Speed: 1/250s Product appearance and printed text may vary slightly by manufacturing batch; this does not affect functionality. Color: Black Material: ABS Package Contents: 1 x iM20 Camera Flash (Other items not included) Note: Lighting and screen differences may cause slight color variation between product image and actual item. Measurement tolerance: +/- 1-3cm.