Casio IT-700/70 - Manual (Page 51)

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Daisy Chaining Dual Charger Units
You can use the following procedure to daisy chain up to three Dual Charger units and
power them with a single AC adaptor.
1. Remove the connector covers of Dual Charger units as required.
2. Connect the connection terminals of the Dual Charger units.
3. Install the connection attachment to the bottoms of the charger units as shown in the
illustration, and secure it in place with the two attachment screws.
Remove these covers.