i can add Clifford tilt sensor, proximity sensor and all that features to almost any alarm. in fact, i just ordered Clifford digital tilt sensor, all extra add on features and Alpine Sec-150 . you wanna know how much everything costs, 580 CND installed. but if i want G4 with all the accesories, the total will be close to 1000 CND. so wha'ts the point?