Introduction
This manual provides essential information for the safe and effective use of Sylvania FlashCubes. These flashcubes are designed to provide supplemental lighting for cameras equipped with a compatible cross-shaped mounting socket. Each package contains three flash cubes, offering a total of twelve flashes (four flashes per cube).
Product Overview
Sylvania FlashCubes are single-use flashbulbs encased in a protective cube. They are activated by an electrical current supplied by the camera's internal battery. Each cube features four individual flashbulbs, allowing for multiple exposures before replacement is needed.
Note: Sylvania FlashCubes are not interchangeable with Magicubes.

Image: Sylvania FlashCubes 3-Pack packaging, showing three flash cubes.
Setup
- Verify Camera Compatibility: Ensure your camera is designed to accept flashcubes and features a cross-shaped mounting socket.
- Camera Battery: Confirm that your camera has a functional battery installed, as it is required to ignite the flashbulb.
- Insert FlashCube: Gently insert a Sylvania FlashCube into the camera's cross-shaped mounting socket. Ensure it is seated firmly.
Operating Instructions
Once a FlashCube is properly installed in a compatible camera, the camera's internal electrical current will trigger one of the flashbulbs when the shutter is released. Each FlashCube provides four individual flashes. After each flash, the cube will rotate (either manually or automatically, depending on your camera model) to present a fresh bulb for the next exposure.
- Take your photograph as usual.
- The camera's battery will supply the electrical current to ignite the flashbulb.
- After four flashes, replace the FlashCube with a new one.
Safety Information
Please read and adhere to the following safety precautions:
- Bulb Integrity: Although each bulb is safety coated and the cube provides a shield, a damaged cube may shatter when flashed.
- Protective Shielding: Use additional protective shielding if operating at distances less than four feet from the subject.
- Static Electricity: Static electricity may cause unexpected flashing. Handle with care.
- Storage: Keep cubes in their original carton until immediately ready to use to avoid damage and unexpected flashing.
- Atmosphere: Do not flash in an explosive atmosphere.
- Child and Pet Safety: Keep flash cubes out of reach of infants, children, and pets.

Image: Back of Sylvania FlashCubes packaging, displaying safety warnings and product information.
Maintenance
Sylvania FlashCubes are designed for single use and require no maintenance. Store unused cubes in their original packaging in a cool, dry place away from direct sunlight and extreme temperatures. Dispose of used flashcubes responsibly according to local regulations.
Troubleshooting
If a flashbulb fails to ignite:
- Check Camera Battery: Ensure your camera's battery is charged and functioning correctly. The flashcube relies on the camera's power for ignition.
- Cube Seating: Verify that the FlashCube is properly seated in the camera's mounting socket.
- Cube Condition: Inspect the FlashCube for any visible damage. Do not use damaged cubes.
- Customer Guarantee: If a Sylvania flashbulb fails to flash, refer to the Warranty and Support section for replacement information.
Specifications
| Feature | Detail |
|---|---|
| Brand | Sylvania |
| Model Number | 91288-1 |
| UPC | 046135912887 |
| Included Components | Three flash cubes per pack (12 total flashes) |
| Compatible Mountings | Cross-Shaped Socket Mount |
| Power Source | Camera's internal battery |
| Flash Sync Speed | 1/60 |
| Guide Number | 22.6 |
| Color Temperature | Daylight |
| Exposure Control Type | Manual (camera dependent) |
| Item Weight | 0.05 Pounds |
Warranty and Support
Customer Guarantee: If, at any time, a flashbulb contained in a Sylvania cube fails to flash, you may return it for replacement. Please contact the manufacturer for specific return instructions and the current address for replacement.
Manufacturer: GTE Products Corporation
Winchester, KY 40391
Made in Belgium
For further assistance, please refer to the contact information provided on your product packaging or the official Sylvania website.