Always wear approved eye protection.
Improper use of knife & scissors sharpener and/or failure to follow instructions can result in injuries. Keep your fingers behind the curved guard- and your thumb securely on the multi-grooved thumb-rest indentation- never in front of it.
Blades are intended for cutting only- and should be handled and disposed of with care. Bending the blade can cause it to break- possibly resulting in bodily injury.