Using low-power microprocessors Ultra low power consumption, longer battery life Built in million code Wireless transmission of data signals Low voltage alarm function Comprehensive automatic temperature compensation Intelligent logic analysis to prevent false positives Anti white light Anti high-frequency interference Working voltage:3V Power Supply:2 x AAA batteries (Not included batteries) Transmission frequency:433MHz Encoding :EV1527 Open space distance: equal 120M Detection angle:Wide angle 110 Detection distance:12M Note:It cannot be used alone and should be paired with a receiver capable of receiving 433 MHz wireless signals Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Colour:White Material:ABS Package Contents: 1 * Detector 1 * Screw pack 1 * Bracket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.