This wireless siren need work with a signal transmit for some of the alarm system (8218G, GSM10A, 5900G) in our store, please tell us your alarm model after placing an order. 1. Fashionable and patented design2. Support wired, wireless linkage control, easy to install3. Smart and adjustable volume with 4 levels (including mute)4. 110dB super loud siren, blue flashing light5. EEPROM information protection, information never lost to ensure information security6. Outdoor solar siren with waterproof function and anti-tamper function7. Wireless intelligent study coding 1527, maximum support 20 pcs remote control and 40 pcs detector8. Built-in 3.7V/2200mAh backup lithium battery9. AC/ DC, twenty-four-hour ordinary guarding without interruption10. Solar power supply and solar power rechargeable