# Frequently Asked Questions
# Hardware related
How many analog inputs (ADC) does the unit have?
Syrus 4G comes with 2 single analog input cables, and 1 analog differential input. Both single analog input support ranges from 0-28V. and the differential input supports 0-11V.
The differential input can be used as a 3rd single analog input cable but it's range would be from 0-11V.
How long does the internal battery last?
Syrus 4G comes with an internal rechargeable Lithium Polymer battery LP503759, with a nominal voltage of 3.7V and capacity of 1200mAh. When connected to an external power supply (+12V DC) the avg consumption can be summarized as follow
|Conditions||Consumption Avg mA||Duration Estimates|
|SoC + Modem + GPS + BT + WiFi||196||~5.8 hrs|
|SoC + Modem + GPS||150||~7.6 hrs|
|SoC + Modem||135||~8.4 hrs|
|SoC only||118||~9.6 hrs|
|Power saving mode||2.9||~393 hrs|
Note that when the external power supply is disconnected and the device enters power saving mode, it will go into a deep power saving mode that consumes ~1mA to prolong the battery life as much as possible.
How fast are the network interfaces?
Syrus 4G has a 10/100 Mbps Ethernet Port RJ45 and 2 MIMO antenas at 2.4GHz. For more details on the network bands supported see the last page on the datasheet.
What is the IP rating?
Is there any failover in case I lose connectivity?
Yes, there's an automatic switching mechanism after 8 hours of no connectivity. If the Syrus4G is using it's external SIM card and experiences 8 hours of consecutive connectivity loss to the internet, it will automatically switch to the the internal/embedded SIM. This time can be configured on the apx-mdm core tool.
Keep in mind is that by default the internal/embedded SIM is inactive, but it can be activated at any point via the Pegasus IoT Cloud portal and placed into a default 10MB plan.
What's the average consumption of cellular data?
The amount of data consumed will depend entirely on the applications it has running. A typical installation of SyrusJS and Telegram can be anywhere between 5-15MB a month, if it uses the ECU monitor then it'll be around 20-30MB a month, and finally if you're looking at transmitting videos then you're going to need GB plans.
Regarding firmware/os updates, Syrus 4G uses mender to update, which features differential secure updates, that allow for updates to be carried out with low bandwidth usage. A full os update will be around 120-150MB, so keep this in mind when choosing a data plan and performing an OS upgrade.