This is basically a standard looking tail cap which is compatible with SureFire lights. The Uniq tail cap is advertised to be compatible with the following SureFire models:
6P / 9P / 6Z / 9Z / C2 / C3 / D2 / D3 / M2 / Z2 / Z3.

The tail cap is coated in a natural colored Type 3 anodizing which should more or less blend in when used with SureFire's with natural finish. There isn't a black version of the Uniq tail cap at the moment. The exterior has a band of diamond textured knurling about 2cm wide. Knurling is cut deep and rough providing very good grip. The rear has a 3-point crenellation which allows the light to tail stand, and at the same time allows the switch to be comfortably activated. There's also a hole for lanyard attachments. The switch has a GITD rubber switch cap, the rubber used is thick and stiff. Inside, the tail cap houses a switch module and electronics which provides the infinitely variable functionality. The switch doesn't have very much travel, there is no on or off position. Rather, each click toggles between functions. This is very similar in tactile feel provided by such lights as NovaTac or LiteFlux LF5 XT, but with slightly more tactile feedback and audible click.

If you're unfamiliar with any of the terms used in this review, click here for explanations on common flashlight related vocabulary.

This Uniq tail cap basically allows users to smoothly ramp output up/down. The key thing to note is that this tail cap only works with compatible lights using LED's. This means that if you have a SureFire 6P which comes with an incandescent bulb by default, this tail cap will not work. You will need replace the lamp module with an LED such as the SureFire P60L.

User interface is very simple. A single click turns the light on as per normal, at the minimum brightness level. Once on, holding down the switch will ramp the brightness up. When the light ramps up to the level you like, simply release the switch. If you hold the switch again, the brightness ramps down. Basically, it ramps bi-directionally on alternate switch holds. While on, a single click turns off the light. Due to the nature of this interface, this switch isn't able to provide momentary activation which most SureFire users would be familiar with. Do take note that this tail cap does not have a memory feature, this means the light will always turn on at the lowest brightness level after off. The range of brightness which can be provided by the tail cap largely depends on the host flashlight. For example, a light which runs a 3.7V li-ion cell will provide a dimmer minimum brightness level while the a light running 2x CR123 cells providing 6V total will manage a brighter maximum level.

The runtimes below is based on using the Uniq LGL which has SureFire compatible threads as a host, running 2x 16340 cells.

The Good - Well finished and machined. Switch feels stiff and secure.

The Bad - Nothing.

The Relative - Allows flashlight host to tail stand. Not capable of momentary activation.

Tail cap (front view).

Tail cap (side view).

Tail cap (rear view).