Product Name: Door-Stopper AlarmModel Number: KD-104Place of Origin: ChinaTechnical reference: 1) Power: DC1.5V/AA(2pcs) 2) Volume: >=85db/3m 3) Working environment: a) Temperature: -10 ~ +40°C b) Humidity: 4) Size: 150 x 45 x 40mm Operating instructions: 1) Open the Bottm Panel. 2) Insert 2 pcs AA(UM-3) battery according to the marking inside the battery compartment 3) Make sure the Metal Plate is unpressed. If it it,push the Stand by Button upwards to release the metal plate to the stand by position. 4) Slide the switch to ON position. Then place the alarm just beneath the door gap. When the door is pushed or the vibration is detected, the alarm will emit 85dB high-pitched sound 5) To turn off the alarm, slide the switch to OFF position