Wireless Security Alarm

Anyone fitted / used one before? They seem cheaper than getting someone to fit one, but are they any good? Or are they too complicated for the average person? I’ve seen Yale ones being sold in the shops but don’t know how well it would work.

ok,i have a dilemma ,which is better wired home alarm sys or wireless,iv been quoted 165 for two motion sensors plus alarm box and keypad all installed or wireless for 399 same kit only alarm box is solar.wiv wired i assume you just hook up to electric and no more worries and ireless i guess i wud have to change batt every 3-6mnths,. WHICH IS BETTER WIRED OR WIRELESS and what brand,i have in mind (5 star alarm for wired) and micromark or yale for wireless