Excalibur electronic K452-CS - Manual (Page 5)

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Special Care and Handling
• Avoid rough handling such as bumping or dropping.
• Avoid moisture and extreme temperatures. For best results, use
between the temperatures of 39º F and 100º F (4º C and 38º C).
• Clean using only a slightly damp cloth. Do not use cleaners with
chemical agents.
Excalibur Electronics reserves the right to make technical changes without notice
in the interest of progress.
Battery Information
• Your Keychain SuDoku uses three LR44 batteries, included.
• Do not mix alkaline, standard (carbon-zinc) or rechargeable
(nickel-cadmium) batteries.
• Do not mix old and new batteries.
• Do not use rechargeable batteries.
• Remove exhausted batteries from the unit.