• Received wireless sensor trigger signal activates alarm and flash light • Built-in 110dB high output alarm • Super bright LED flash light • Battery low / trigger indication LED • AC adaptor operation (included )with 4"AAA"size batteries backup (not included ) • Siren+Flash light/siren only/flash light only switch • Entry delay (0/10 seconds ) timer select switch • Wall mount screws / anchors included • Alkaline battery / recharge battery select switch • Wireless remote control for ARM / DISARM / PANIC • Compatible with additional total 8 wireless unit to expanding the system