Brand N/A Model V90 Quantity 2 Color Green + black + silver Material PCB + plastic Specification COB seal; Working voltage: 2.4~3.6V; Small simple circuit can achieve three different alarm through different connection; Improves working efficiency by changing resistance to control sound speed Features Choose void: alarm VCC: fire alarm grounding: emergency alarm; Must choose voice and then power on; RF: 100~240Kohm; The larger RF the slower sound speed or vice versa Application Used to be as alarm circuit and module during electronic design English Manual/Spec Yes refer to www.vecees.com/user manual/0113063009266150.zip Packing List 2 x ICs