Casio DT-X7 - Manual (Page 22)

E-20
21 Strap Holes Used to attach the hand strap. Also used for the hand belt.
22 Reset Switch Used to reset the Handheld Terminal.
23 Hand Belt Holes Used to attach the hand belt.
24 Battery Pack Cover
Lock Switch
Used to lock the battery cover and to release.
25 Battery Pack Cover Used to cover the battery compartment that holds the battery
pack inside.