Working voltage: DC 6~12V; Recommend voltage: DC 5V; Recommend battery: CR2032 (3V); Working current: 35mA; Standby current: 1.2mA. Note: It is kits only. That is to say, all items are not welded on the PCD board. Buyers have to weld them on the PCB board by themselves. We gurantee all items on the following listing included. Only for professionals. Kits assembled is not a very complex work but if you are not professional, item maybe get broken. We cannot offer the warranty for incorrect welding and assembling.