Balancebox WINX® 4B - WHITEBOARD LOCKWhiteboard Lock for Winx 4b, Two (2) keys 481A80 Whiteboard Lock for Winx 4b The Whiteboard Lock for Winx 4b is an accessory for your Winx 4b Touchscreen Whiteboard Frame. The Whiteboard Lock gives you the possibility to lock the closed whiteboards and protect your interactive touchscreen panel against unwanted use. All Whiteboard Locks use the same key, for easy and comfortable use throughout the entire building (when bought in higher numbers).