Is node-scp2 implementing sftp instead of scp?

I tried node-scp2 to copy files to an embedded evice that only supports scp but not sftp. I alwas get an error immediatly after connect: exit code 127. This indicates that the server doesn't support sftp, but expected that node-**scp**2 doesn't use the sftp-protocol but rather like the name implies scp.
Do I need to configure the lib to use scp? Do it support scp, anyway?