... alarming lock, motorcyle, electrombile, rolling door and so on.Adapt high-tech integrated circuits and digital se bike alarm lock,alarm lock,bicycle alarm lock ... Positive and negative.Technical parameter: AM-J101 (Double opne)(1) Alarming: automatic and all around alarm(2) Color: Plating white ... when you open the origianl package.Other abnormal situation. bike alarming lock,alarming lock,bicycle alarm ...