horn

horn "1 with shock-controlling function; 2 the button is for setting or cancelling the alarm . 3 if the magnet leaves the host up to 10mm or above , the alarm will sound,and will last for 25 seconds(nothing can stop it ) though the distance you adjust is less than 10mm. 4 the IC can indicate the lack of power through the LED light 5 and the battery is available for 3 years if sounding once one week. 6 very slim ,pasted on doors or windows in office ,home or warehouse "