Specifications:Auto-alarming system & locking system, can be used alarmed or without alarmThree tone alarm Automatic reset Dual Shock & Movement Sensor Lock bodyCorrosion Resistant, weather resistant, Ice Spray Proof & resistant against saltAnti-muffle design, Anti Drill, Anti bumper prevents scratching Removable Alarm Module Lock shackleHot processed hardened Stainless steel, Anti twist shackle, Anti cut,Double sides removable shackle Lock batteryTamper proof batteries 12pcs of button batteries free of charge Lifetime12months under usual use Lock keysAdvantages of this alarm lockCan protect your properties from unnecessary lost FeaturesAlarm resets automaticallyBatteries sealed in tamper-proof compartment which can only be accessed when lock is openHigh-security cut keys