- GSM Quad-band, support 4 networks
 - One trigger for arm & disarm SMS notification
 - Four controllable outputs
 - Ten voice call numbers and ten SMS numbers, can be modified by SMS
 - Two voice recording for trigger 1 and trigger 2
 - Compatible with most control panels that use the contact ID protocol
 
User Manual: https://tinyurl.com/ALBox-HTD2A