Shenzhen Chitongda Electronic Co.,Ltd established in 1998, it creates a famous brand ?JOYHOME? in the security alarm field with people over 2200. The products are Auto-dial alarm system,Intelligent Lock control alarm system, GSM alarm, intelligent appliance control alarm system, all kinds of sensors and detectors, etc. Our alarm system is assessed a new Hi-tech project as ?Chinese Prestige Advance Brand? and ?Chinese Consumer Credit Standing Brand?by Science&Technology Bereau. Regarding the details of each product, you can log in our website(under building): About the competetive prices, if you do need for the reference, just let us know. If you need the samples for the quality test, we also will provide as soon as possible. At last, we guarantee our after-sales service will satisfy all kinds of selective customers. Wish sincerely that we can cooperate soonest Best wishes and regards Manager: Mr Daken