KCRIUS(TM) 4 in1 Dog Training Shock and Vibration Collar, Remote Trainer for 1 Medium/large Dogs 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