Hi Madhukar / Vivek
you can use mobile data entry functionality , below is the link for details.
Mobile Data Entry (LE-MOB) - Warehouse Management System (WMS) - SAP Library
RF Scanning devices can be used to read bar codes , these devices are connected wirelessly using SAP ITS mobile technology and SAP ITS mobile is readily available and can be enabled by Basis consultants. one can use Wired scanners as well directly ( something similar to what we have in retail stores) OR Scanning terminals .
There are certain, RF device compatible , standard transactions provided by SAP ( Hint: All the transactions starting with LM )
If standard transactions do not meet your requirement you can always create a custom one to be used on the RF Device by adding the same to RF Menu .
Hope this helps.
thanks
Girish