An electronic candle which simulates a flickering flame is provided. Each of the dome patella components and the anatomic patella components is interchangeable with a plurality of femoral components. The implant also has a plurality of particles dispersed in the structure that are adapted to convert incident radiation into heat energy when irradiated with electromagnetic radiation. Collar-engaging loop portions attached to the dog collar flashlight case allows a collar to engage the dog collar flashlight and fix the dog collar flashlight to the dog or other animal.