ATC New 4in1 No Barking Harmless High Sensitivity Dog Training Collar Vibration Shock Device System by Supply-Shop Length: 66mm Height: 38mm Width: 36mm Weight: 56g (module + battery) Power: 2 x 1.5V AAA battery (included) Collar length adjustable from 35cm to 58cm. Package include:1 x Remote transmitter, 1 x Collar, 1 x Test Light ,2 x AAA Battereis