Garmin Delta Dog Training Collar Continuous and momentary stimulation (18 correction levels), tone and vibration modes Delta range: 1/2 mile; Delta Sport range: 3/4 mile Delta features 3 training configurations while Delta Sport offers 5 training configurations Compatible for up to 3 dogs (with purchase of additional dog devices) - Waterproof (IPX7) and rugged design Long-lasting rechargeable lithium-ion batteries used for both the handheld units and dog devices -each charge lasting up to 3 months