chirp, definatly, just so that i know that my car is locked, if i hear the chirp it stays with me so i dont have to be like
"did i lock my car? *contemplates getting up and going out and checking* fkn hell! *gets up and goes to make sure the car is locked*"
+ the whole 4am in the morning thing? its not like a chirp is going to wake up the ENTIRE neighbourhood, a little chirp or beep i think is good