Works with Grandstream GXP-2010, GXP-2020, GXP-2100, GXP-2110, GXP-2120, GXP-280, GXP-285,BT200,BT201, Zultys ZIP 4x4, ZIP 4x5 , Pansasonic ,AT&T Cordless phones with 2.5mm jack. IF YOUR PHONE IS ...

This score reflects the tested distance a phone can maintain an intelligible conversation, make a call and receive a call. We report a score instead of a distance because range can differ greatly ...