LONG & SHORT CONTACTS Includes two lengths of stainless steel, insulated contact points for reliable performance in wet conditions and extended comfort for any coat length.Special Feature:vibration,lights. BARKLIMITER Built-in BarkLimiter with Advanced Bark Correction Technology. Collar compatibility: 0.75 inch (1.9 cm) RANGE / FREQUENCY 1 mile range with 27MHz radio frequency for PRO 70 and PRO 550 Includes - PT 10 dog device, 3/4” red collar strap, AC adapter, charging clip, contact point set w/ wrench, manual.Battery life: 60 hours - compatible with Garmin Delta SE, Pro 550, Pro 70 and Sport Pro