I use INNOTEK and not so happy with them... if u can find Tri-Tronics is better.
My INNOTEK have 7 levels and not so friendly to change levels, with the Tri-Tronics u can change levels quickly.
If u want the Tri-Tronics so find this model
Tri-Tronics Sport 50S
Rugged, reliable and simple to use
1/2 mile range
6 levels of momentary and continuous stimulation
No stimulation safety "N" position on transmitter
Transmitter contains all controls and comes with lanyard
Insulated contact points are made from surgical stainless steel
Bigger and brighter LED on collar
Easy-On Switch is located on the waterproof collar
Collar strap adjusts to fit any size dog
Transmitter uses replaceable 9V battery (included)
Collar uses rechargeable Ni-MH battery - charger and battery included
Basic Training Video and Manual included
2-year manufacturer's warranty - no charges for service, labor or parts
It's 266US$ in the US.