Includes one Delta SE dog collar with rechargeable lithium-ion battery and collar strap; Improve communication with your canine companion, even when off the leash or distracted; Choose between tone, vibration and 10 levels of momentary and continuous stimulation at up to a half-mile range when paired to your compatible handheld; Battery life (for handheld): up to 60 hours; Compatible with existing Delta and PRO series dog handhelds