This is not an expandable system; can only train one dog. Remote battery life: 1 year depending on usage. Operation range: 150 yards. Collar strap: grey nylon 3/4″ wide. System includes: Small contact points and M/L contact points. RF Technology: 315MHz Correction mode: 9 levels static correction and warning tone Collar battery: CR2450 Remote battery: 2 AAA batteries Collar battery life: 480 hours depending on usage
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