This LED hand‑gesture light is a novelty car accessory that lets you display one of several gestures (for example a middle finger, thumbs‑up, wave or “thank you”) on your rear or side window using bright LEDs and a small wireless remote. It’s designed to attach to your car’s interior glass or a visible rear window. For example, one listing says it uses 176 LED lamp beads for day & night visibility.

Installation is simple: stick the unit in place (clean surface first), insert batteries (for the LED panel and remote separately), and use the remote to select the gesture and/or switch the light on/off.

This accessory is intended for most cars (sedans, hatchbacks, SUVs) as long as you have a rear or side‑window area where it can be mounted inside facing out. Before buying, check:

• That you have a suitable flat surface inside the car (like the inside of the rear window) where the product’s adhesive (or Velcro) can stick securely. Many kits include 3M adhesive or Velcro strips.
  
• Check whether your vehicle’s window tint or curvature might reduce visibility of the LED display.
  
• Battery requirement: For example, one unit is powered by 3×AA (for the panel) and the remote uses 1×12 V (23A) battery.
  
• Legal/regulatory aspect: Since this is a novelty gadget, you should check that mounting it will not obstruct the driver’s view or violate local vehicle laws (some jurisdictions warn about accessories that block windows)

Here are some key pointers:

• Visibility & brightness: The unit features high LED density (e.g., 176 LED beads) and is designed to be visible both day and night.
  
• Installation: Clean the glass surface thoroughly before mounting. Some adhesives may fail in very heat‑exposed areas (e.g., direct sun on the rear window) so placement matters.
  
• Maintenance: Replace batteries when you notice dimming. Secure wires and the remote where they won’t rattle or fall off.
  
• Safety & decorum: While fun, remember it’s visible to other road users. It could escalate interactions if used aggressively. Some comments note that drivers “using the middle finger LED light to roast tailgaters” may risk provoking responses.
  
• Legal/regulation caveats: Some authorities have flagged LED hand‑gesture lights as potentially illegal if they obstruct driver’s view or impersonate signals. One article warned of fines for such accessories.
  
• Warranty & support: Because this is a novelty gadget, ensure you communicate your return or warranty policy clearly (especially for global sales) and advise buyers about battery replacement and mounting conditions.

Yes — the product uses around 170‑180 high‑powered LED lamp beads, making it bright enough for both day and night visibility.