... ’ wealth safety, etc. OPERATION INTRODUCTION: Open the battery board, distinguish anode and cathode, put into ... AA1.5V(in order to prolong the life of the products, suggest to use alkaline batteries ... not use it in a long time, please take off the battery. THCHNICAL PARAMETER: Voltage: DC4.5V( ... 3batteries of AA1.5V)Volume:120dBMode of the reacting: Separate from magnetism, AlarmMethod of installation: ...