Installation and test
Installation: Alarm bell incliude alarm bell and base. First, fix the base on the wall, connect the wire
Out from the bell to the power. And then install the bell to the base. Test: Switch on the power to test the alatm bell wether operating is proper. 
Other: Dont not connect the product with high voltage, or will damage the bell. 
Make the alarm-hammer downward when installation the alarm bell.