Check the listing for details. Tri-Tronics Multi Sport 3s 2S Shock Collar Receiver Pro Field Classic. Condition: For parts or not working. Listed at 49.99 USD. Up for sale is a Tri Tronics Multi Sport (Sport) series receiver. This is the sport series receiver with the round charging plug in the back. This was used with a multi sport system but will fit several of the Tri Tronics Sport systems from this generation with the round charging plug. I have several of these for sale so the receiver shown in the photo is only a representational photo and will likely NOT be the exact receiver you receive. You will receive 1 receiver that has been 100% tested but no battery included (per USPS regulations) As of the time of this listing, batteries are widely available on Ebay for around $15 bucks. There is nothing else included, no collar straps included, no transmitters included, just a receiver similar to the one shown in the photo. These were produced back in the early-mid 2000s and were one of Tri-Tronics most popular and reliable systems. I am still using a Tritronics Multi Sport 3S system that I bought new and it has trained dozens of dogs and been on hundreds of hunting trips! The reliability of this system is legendary! ***This will work with the G2 or G3 EXP series transmitters which were the next series after the Sport series*** bigreenrtopcan2