Swann Alarm door and motion Sensors antenna siren and remote compatible with Swann Dvr 3450 3425 SRHOM-ALARMD Unique all-in-one DIY (Do-it-Yourself) bundle with alarms &siren for extra deterrent Includes 4 x wireless window/door sensors (and 4x wired window/door sensors that connect to the wireless sensors for added protection) and PIR movement sensor that communicate wirelessly with the anti-intrusion indoor siren The anti-intrusion alarm is bad news for intruders, as activity triggers a loud 100dB siren The motion-activated alarm sensors can trigger the siren, alerts to your Smartphone or tablet & video recording; movement detected by the cameras can trigger alerts & video recording, for the perfect mix of deterrence & evidence Compatible with Swann Dvr 3450 3425 ,SWVAK-83425C, SWNVK-460KH2 & SWNVA-460AH2 alarm security kit