12V Wired Doorbell Home Access Control System four-wire doorbell Supporting No Install Battery Door Bell Chime External kit

SECURITY ACCESS CONTROLExternal wired door bell for security access control, ABS SHELL MATERIALAdopted premium abs shell material, fireproof and antiflaming, sturdy and , long life service, PRODUCE CLEAR AND LOUD SOUND90dB build-in loudspeaker, produce clear and loud ding dong playing bell sound, not afraid of can't hear doorbell, No need to replace or add battery, using access control power supply, which is , convenient and save money, EASY TO INSTALLEasy to install, wall-mounted or double-sided adhesive paste, , , , ,