Features:
* 868MHz(EU) / 915MHz(US) Radio Frequency with operating range up to 250M for SM831, SP831 and 150M for SR831 remote control 
* 2 wireless intruder zone and 1 emergency zone 
* Rolling code technology provides millions code combination for maximum security protection 
* Exit/Entry delay 
* Alarm Stop sound selectable 
* Control panel built in 433MHz Transmitter to control outdoor solar powered siren and strobe 
* Feature with tamper protection, 
* Terminal block provided for hardwire device, siren or dialer connection