I have a Tri Tronics 2 dog training system.  This is a great set up and everything works.  It has 2 collars with chargers that run off of one remote. specs below

Tri-Tronics Best Selling Long Range Remote for over 10 years! 5 static correction levels and Tone only setting.

Designed for trainers and hunters that want simple, basic control. 5 levels of continuous stimulation. The Classic 70S has easy one-button operation. The audible tone in the collar can be used for praise, warning, or silent recall. The single stimulation button is easily identified by touch so that you are always sure of your correction. Insulated contact points in the collar provide consistent and reliable stimulation in all situations including wet conditions. Collar strap fits all dogs.


•5 levels of continuous stimulation -Selected with transmitter intensity selection dial
•Trickle charge mode 
•Extended battery life - Audible tone in the collar 
•No stimulation "N" safety position on the transmitter 
•ON/OFF switch activated at the receiver 
•Waterproof collar 
•Insulated contact points to ensure consistent and reliable stimulation in the water
•1-mile range 
•Instantly change stimulation intensity from the transmitter 
•No external collar antenna 
•Adjustable ollar strap with a square double buckle and metal keeper 
•Rugged foam lined carrying case 
•Manual