Specifications:Maximum 650 feet or 200 meters operating range in open area Up to 52 unique ringtones30-110 dB Volume rangeLED indicatorsOperating Voltage: 3 V DC (1 X 12V23A Battery)Working Frequency: 433.92 MHz ± 280KHz Transmitter power consumption: Operating Temperature: -22°F to 158°F or -30°C to 70°CInstallation gap:≤ 1 cmPackage Contents: 1x Receiver1x Magnetic door sensor (Battery included) 1x Adhesive tapes1x User Manual Notice:This security alarm has no power switch,if you want it off,please unplug the receiver.How to install:You just need to plug receiver into an electrical outlet,the security sensor can be easily mounted to anywhere with adhesive tapes.adhesive tapes are good enough,nails are only to be secure it.Change the ringtoneStep 1.press the chime section choose your favorite melody.Step 2.press and hold down the volume button ,until it makes a "Ding" sound and the receiver indicator flashes.Step 3.separate the sensor quickly,it will makes a "Ding-Ding" sound and the receiver indicator flashes.Step 4.use sensor again to confirm whether the current rington is the one you have set,if yes,the pairing is completed.How to set more transmitters or receiversStep 1.Press and hold down the volume button on the receiver ,until it makes a "Ding" sound and the receiver indicator flashes.Step 2.Separate the sensor quickly,it will makes a "Ding-Ding" sound and the receiver indicator flashes.Step 3.Use sensor again to confirm whether the receiver can sound,if yes,the pairing is completed.Low power alertIn normal status,blue indicator will light up once when it is triggered;but in low power state,indictor will make 2 more quick flashes after the normal one,battery type:12V23A battery
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