The Canine Calmer System provides a minimum of two 15-minute treatments/day for 4-6 weeks. The life of the Loop depends on the battery. You're likely to get more than the minimum number of treatments noted above if you allow the Loop to recharge for 2 hours after every 15-minute treatment. It can be hand held or attached to a vest that the pet will wear. Treatment plan is two 15-minute sessions per day. It can also be used as needed. The device is available in 5" and 7" sizes. Vests come in 5 sizes. Note - Large and X Large vest comes with the 7 inch device.