* Collars are 30% smaller & lighter than any other collar
* Fast recharging, long life lithium ion batteries
* Exclusive Ready Test features include:
* Right fit Collar fit indicator - audible click when there is a perfect collar fit
* 3 Level battery status - never run out of power
* Automatic Systems Check - green light indicates all systems functioning
* Same features as SD-2100 Transmitter
* Collars are compatible with indoor Zones pet proofing barrier
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