Safes Lock, Electronic Lock manufacturer / supplier in China, offering 4.2V to 6.8V Electronic Flash Safe Lock More Flexible Use, Working Voltage 4.2V to 6.8V Cheap Pilot Lamp Electronic Lock Adopting a Light Bar Indicator Light, Working Voltage 4.2V to 6.8V Password Electronic Lock Password Can Be Set to 3-8 Digits and so on.