Need a cellular sensor.
-send sms on detecting close-up movement (not only human, material too within a few inches-can be touch activated too)
-A case which houses a sensor, sim card, battery and technical aspects.
-Needs to be weather proof (water proof, withstand and operate in temp of -40 c - +50 c)
-Long lasting rechargeable battery (at least 3 months with one sensing and messaging a day)
-compact casing ( width and height not more than a few inches. depth less than 1/2 inch preferably)
13 freelancers are bidding on average $1247 for this job
I have experience in all the mentioned relevant areas. I am into mobile, embedded, sensor and app technologies. Can suggest on right part to chose with my experiences and best solution for you.