Runtime environment notes

System properties

The Contactless Communication API supports the following system properties.

**Table:** Contactless Communication API system properties
System property	Description	Value
`com.innovision.jewel.version`	Returns the `JewelTagConnection` interface version supported by the device.	Example: `1.0`
`com.nokia.nfc.llcp.version`	Returns the `LLCPConnection` interface version supported by the device.	Example: `1.0`
`com.nokia.nfc.nxp.mfstd.version`	Returns the `MFStandardConnection` interface version supported by the device.	Example: `1.0`
`com.nokia.nfc.nxp.simpletag.version`	Returns the `SimpleTagConnection` interface version supported by the device.	Example: `1.0`
`com.sony.felica.type3tag.version`	Returns the `Type3TagConnection` interface version supported by the device.	Example: `1.0`
`javax.microedition.contactless.version`	Returns the Contactless Communication API version supported by the device.	Example: `1.0`

Security

The Contactless Communication API uses the MIDP 2.0 Security Framework.

For information about the Contactless Communication API methods that require a permission to be invoked, see section Contactless Communication API (JSR-257) in the Security developer's guide.