Embedding a flashlight in your promotional keyrings is not quite as unique as it once was, however it is still an excellent idea for creating a piece of functional paraphernalia that your clients are likely to appreciate. Needless to say the light element in your promotional keyring is not going to be a traditional incandescent bulb, but rather a new LED. Not only are LED is much more power friendly than traditional incandescent bulb, but they also do not give off much heat thus making them perfect for a plastic or rubber casing. This is important because more than likely your promotional keyring is not going to be constructed out of anything more durable than plastic as such it is important that the bulb used in your flashlight does not melt or burn through the casing.

The casing for your flashlight promotional keyrings does not have to be plastic, though it is the least expensive and easiest to produce. Alternatively you could go with a metal casing. You have a couple different options when choosing a metal casing for your promotional keyrings; including novelty shapes such as miniature representations of your products, or caricatures of the service field you are in. If you are in the house building business you may consider a small metal model house that has a light inside.

While this is not an actual flashlight on your promotional keyring and it is still quite clever. If you are less novelty oriented but still want to go with the metal promotional keyring then you may want to just attach a small metal flashlight to your promotional keyring. This is probably the most functional design you'll ever find, and because miniature flashlights are produced for a number of reasons it is likely that you will be able to get a good deal on the supplies.

In addition to metal you could also go with the rubberized casing for your flashlight attached to a promotional keyring. The main benefit of a rubber casing is that you will not need an exposed switch to turn on and off the flashlight, rather because rubber is flexible you can just use a pressure sensitive switch for your promotional keyring flashlight that a customer can access by pressing on the casing itself. Additionally rubber comes in many saturated colors that can really be eye-catching. Unfortunately you will not be able to create any complicated shapes for your promotional keyring because rubber is amply not the best material for the job.
To add an interesting twist to the equation you can also choose to use colored LEDs for your promotional keyring flashlight. Like some other options this will greatly decrease the actual usability of the product, but it will increase the novelty value so in the end it probably evens out. Whatever you choose having a flashlight to your promotional keyring is a great way to set your keyring apart from the pack and help catch a customer's eye.