... and beautiful wireless voice door phone for apartments in hot sell1.Voice clear and loud2.Transfer ... of multi-way intercom system,can be uesd in offices,workshops,homes,buildings ect.Using the ... to 500 meters aboveInstructions:1,Boot:Connect the power or battery2,Standby :Receiving mode, the power light flashes ... drops twice, busy prompt ,refund standby. F:In the process of waiting for the off-hook, ...