Read this article to find out more about CR-15 and CR-21 docking station compatibility...

 

DS-9500/DS-9000 with CR-15
Charging via USB cableYes
Charging via AC AdapterYes
Hands free recording via RS-28HYes
Hands free recording via RS-31HYes

 

DS-7000/DS-3500 with CR-21
Charging via USB cableYes
Charging via AC AdapterYes
Hands free recording via RS-28HNo
Hands free recording via RS-31HNo