New dog training shock collar for 2 dogs by Dogwidgets. Collars has 2 levels of shocks and 1 level of vibration and has 600 feet range. Collar will work with small, medium and large dogs from 15 to 100 lbs. You can train your dog individually with a shock and vibration or correct your 2 dogs at the same time with a vibration. Very safe and humane. The set contains: 2 straps adjustable from 12 to 20 inches long, 2 receivers, 1 transmitter(9-volts battery included), 1 charger, 2 sets of rubber and metal prongs, 2 shock tester and user manual. 6 months warranty and fast technical support from Dogwidgets.