1 pc collar. With battery.
S: width 2.5cm, adjustment range 35cm - 43cm
M: width 2.5cm, adjustment range 40cm - 48cm
L: width 2.5cm, adjustment range 45cm - 52cm
Please allow slight dimension difference due to different manual measurement.
Light-emitting mode: Long light, flashing, slow flashing, off; through the switch control ON / OFF.