A word of advice if you will want the GSM communications, you will want to buy the Impassa with that option pre-installed because the GSM module can not be added after the fact.ДЄnother place where the Impassa is disappointing is with interactive services. You can also choose to have an integrated GSM in the main unit. There is also a 100mA aux power output to power accessories. This is only enough to power a status LED or a small relay. When used for an output they are limited to 50mA per circuit. When used asВ a zone you can connect anything except fire or Carbon Monoxide detectors. The main panel has two programmable points that can be used for hardwire zones or relay outputs. This causes it to have a long delay before it will react to anything. The other really annoying thing about the wireless keypad is that it goes to sleep even when it is plugged in. If you choose to use the AA batteries as the only source of power you will want to keep a large supply of spares. From having a lot of real life experience with this keypad, I can say without a doubt, you will want to buy the additional plug in transformer for the keypad. The WT5500 wireless keypad operates the same as the main keypad. The Impassa is also limited to only one additional keypad. This is well less than the advertised life. The exterior siren uses standard D cell batteries, and from my experience, have mostly lasted less than 1 year. The interior siren uses lithium batteries and will only average 1-2 years of life (DSC advertises 2-4years). They also offer a 4 button keyfob with an integrated flashlight.ДЇor sirens, you only have the option of a small interior siren or a large exterior siren. The system comes with a standard 4 button (Away, Stay, Off and Panic buttons), but there are 1 button, 2 button, 4 button and 5 button keyfobs available. DSC has a wide variety of kefobs available. In addition to the available zones, the system can have a total of 16 wireless keyfobs. The system can use any of the DSC 433mhz wireless devices. Your not likely to run out of zones with this panel. Each installed point of detection (door or window sensor, smoke detector, motion detector, etc) uses one available zone. With 64 available zones, the Impassa has more available zones than most of the other wireless alarm systems on the market. The buttons on the keypad, like most DSC keypads, are made of a rubber material that will last for a long time without wearing. It has a very nice look to it and has a gentle blue back light on the screen. The Impassa from DSC is a complete, self contained, all in one wireless alarm system.

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