Tri-Tronics Pro 500XL - Manual (Page 11)

INSTALLING THE COLLAR STRAP
Your Remote Trainer is shipped with the receiver
separate from the collar strap. Install the strap as shown
in the illustrations.
On multi-dog units, be sure to install the correct color strap
on each receiver. Use the colored strap that matches the
colored dot on the receiver.
T R I - T R O N I C S
I n s t a l l i n g t h e C o l l a r S t r a p
Slide the correct color strap through one side of the receiver,
then through the other side. Snug the strap firmly against the
surface of the receiver. Position the buckle where it is convenient
for the size of your dog's neck.
Installing the Collar Strap Page 7