Instructions for use， the effective distance of the product warning detection of 8 meters， about the effective detection distance of about 110 °， do not exceed this range during installation. This product is used as a welcoming， install on top of the door or wall， freedom tuning probe angle to the appropriate location. When guests enter the detection range， automatically send voice prompts owner. This product is used as a warning when used， the probe as installed on the facing balconies， windows， stairs and other thieves easy access to the place， the height of the installation of the probe within the appropriate range and the freedom to tune the probe angle to the appropriate location， alert when the thieves entered inform the owner of the voice.

Product features， using 3 AA batteries， ultra-low power， standby current <0.3mA， free angle adjustable wire-free construction， sonorant about 85dB / m.

Note that thing every time you install a battery， the product needs to be "self-test"， about 15-20 seconds， then enter the normal working condition. If you use the ambient air temperature is too high (over 30 °)， detection distance will first be far to near phenomenon， which is normal.