I just bought a Tracer light for my tri-tronic collar receiver. The screws which are supplied with the tracer light that must be used to install the tracer light are way to short. I could only get about 1 1/2 threads in to the receiver (with great difficulty) when I installed the light. Evidently this problem is known by tri-tronics but they have ignored it to date. The online vendor I purchased it from was gracious enough to offer a dogtra beacon light in exchange when I questioned the screw length of the tri-tronic tracer light. I declined the offer and will take up the matter with tri-tronics should I lose my battery, or worse have my receiver damaged due to water intrusion. I like the fact I can turn the light off and on from my tri-tronic transmitter, you cannot with the dogtra beacon light I was offered. I also live on a mountain and get a lot of fog here which I need a light for and would rather not be without one while I go through the exchange process.
If you haven't bought a tracer light from tri-tronics I recommend you do not until this issue has been addressed by tri-tronic.