*433MHz wireless intelligent study coding, maximum support 20pcs remote controls, detectors or transmitters total 40pcs to wireless strobe siren host. *Compatible with PT2262 normal encoding(Resistance 1.5M-4.7M) and 1527 encoding(Resistance of 150K-470K) detectors and remote controls. *Once triggered, it will sound 110dB with strobe flashing to frighten away the intruders/thieves or notice you and your neighbors about s-moke alarm and gas leakage, then take measures. *Built-in Ni-Hi rechargeable battery 3.7V/600mAh, standby 8 hours above. AC/DC, plug and play, twenty-four-hour ordinary guarding without interruption *EEPROM information protection, information never lost, to ensure information security.