Note: This flash is not compatible with ZV-1F, A9III, A99, A77, A350, Rebel SL3, 250D, T7, 1500D, 2000D, T100, 3000D, 4000D, 200DII, X-A3, X100F, or X100T. Troubleshooting for failure to flash: 1. When using the flash for the first time, wait for the flash recycle indicator to turn green — this indicates recycling is complete. If the indicator remains red or white, replace the battery with a new or fully charged one. 2. If the flash does not fire, go into the camera’s menu and set the flash mode to “Manual / M” mode. Troubleshooting for suboptimal performance: 1. Shutter Speed: This flash does not support TTL or high-speed sync. We recommend using 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 as needed based on lighting conditions. 3. Aperture: Start with f/2.8 and adjust narrower as needed based on lighting conditions. Long-lasting Lithium Battery: Built-in 3.8V/470mAh lithium battery delivers up to 440 full-power flashes with approximately 3-second recycle time. Features a USB-C charging port for fast recharging. Compact Design: Measures 1.54 x 1.5 x 1.16 inches and weighs only 31g — fits easily in a pocket or small bag, ideal for street photography and travel. Compatible Mountings: Designed for ZV-E10, ZV-1, A7III, GR3, GR3x, and F1. Not compatible with ZV-1F. Flash Type: Hotshoe Flash Sync Speed: 1/250s Product appearance and printed text may vary slightly by batch, but functionality is unaffected. Color: As shown Material: ABS Package Contents: 1 x iM20 Camera Flash Note: Color representation may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.