It sounds like you're looking for a projector ceiling mount kit with a configuration described as "1.5+1.5," which could refer to the adjustable length of the mounting poles or the flexibility of the kit. This type of mount is typically used for mounting a projector on the ceiling with adjustable arms or poles for precise positioning.

Here’s what a Projector Ceiling Mount Kit with such specifications may include:

1. Adjustable Poles: The "1.5+1.5" might indicate two adjustable poles, each with a length of 1.5 meters (or 5 feet). These allow flexibility in positioning the projector, especially for different ceiling heights and throw distances.

2. Mounting Bracket: This is where the projector sits. The bracket would be compatible with various projector models and should offer flexibility to tilt, rotate, or adjust the angle of the projector for optimal viewing.

3. Ceiling Plate: The mount kit would typically come with a ceiling plate for easy attachment to the ceiling, along with mounting hardware (screws, anchors) to secure it.

4. Adjustability: The kit would likely allow you to fine-tune the projector's height and position after installation. This is crucial for ensuring the projected image aligns perfectly with the screen.

5. Heavy Duty Construction: These mounts are often made from strong materials like steel or aluminum, ensuring they can support the weight of the projector securely.