The HL-D11 has dimensions of 14X12mm, a power supply voltage of 3.1-12VDC, and an operating current of 2-3mA. When someone enters the detection range of this product, the microwave radar sensing module's output Vout will output a TTL high level. After a delay period (operating delay), the output will return to a TTL low level. After the sensing module is activated, if there is human activity during the delay period, the module's output Vout will continue to output a TTL high level until the person leaves and a delay period (operating delay) has passed, after which the output will return to a low level.