Compatible with Defender V1 and V2 models ONLY with proprietary charger (GDI-EXDFNR00, GDI-EXDFNR01, GDI-EXDFNR02, GDI-EXDFNR03, GDI-EXDFNR08, GDI-EXDFNR09, GDI-EXDFNR22). You can identify which version of Defender you have by looking on the bottom of the unit for a V1, V2, or a V3. For V3 models, you can find the replacement charger here. The power adapter required for The Defender is unique (cannot be used with other models and no other adapter can be used to power/charge The Defender). AC Power Defender: 18V, 1A Power adapter barrel connector diameter: 3.8mm Power adapter barrel connector length: 1.2m Wire gauge (AWG): 22AWG