Spinbrush Pro+ Deep Clean Value Pack, Battery Toothbrush for Adults, 2 Brushes & 4 Replacement Heads Directions : Brush head is replaceable. To replace brush head: twist counterclockwise 90 degrees and pull away from handle. Slide on new head and turn clockwise 90 degrees until arrows are aligned. Batteries are replaceable. Package includes: 2 AA batteries. To replace batteries: turn and pull down handle base. Replace with two new AA alkaline batteries only! When replacing batteries, follow symbols for correct positioning. Operating instructions: 1. Slide switch up to turn on brush. 2. Gently glide bristles back and forth against the teeth/gum surfaces without pressing hard for about 2 minutes while brushing your teeth.