Manufacturers directly available PTM-8668L battery adapted XPR3000.XPR7000.DP2600.XIR-P6600.GP328D.GP3338DLKP.DGP8050.DGP5050.DEP550.APX2000.APX400.DP440.DP40.DP40.DP1088 . APX2000. SRX2200. XPR7000E model intercom