# DO107 Sleep modes
There are four sleep modes: GPS sleep, Deep sleep, Online Deep sleep and Ultra Deep sleep mode.
# GPS Sleep mode
When the device is in this state, Sleep mode timeout starts counting when the device is in STOP mode. After the timeout is reached and all conditions for GPS sleep mode are met, the device goes into sleep mode. When in GPS sleep mode, the FMB920 turns the GPS module off and continues to make new periodic records. Do107 exits GPS sleep mode if ONE of following conditions is true:
- Movement by accelerometer or configured movement source is detected :
- Ignition (configured ignition source) is turned on.
# Deep Sleep mode
While in deep sleep mode,The gsm / gps modules is off hence it is impossible to wake up device via SMS
sleep mode if ALL of these conditions are met:
- Do107 is configured in Deep Sleep mode and sleep timeout is reached;
- Device time must be synchronized with GPS satellites;
- Ignition (configured ignition source) is off;
- Movement is not detected by the accelerometer or configured movement source;
- Min. Record Saving Period (Data Acquisition Mode settings) must be larger than Open Link Timeout parameter, so that Do107 could close GPRS link;
- There are no SMS messages being received;
- Data socket(s) are closed;
- Data sending is not in progress;
- FOTA is not in progress.
Do107 exits deep sleep mode if ONE of following conditions is true:
- Movement by accelerometer or configured movement source is detected;
- Ignition (configured ignition source) is turned on.
# Online Deep Sleep mode
In this mode the device works as in deep sleep mode, but without deregistering from GSM network. GSM part stays powered so this increases power consumption. In this mode device should send/receive SMS and make/accept calls. It does not close GPRS context if one was previously opened. Conditions to enter online deep sleep mode are the same as entering deep sleep mode. Do107 exits online sleep mode if ONE of following conditions is true:
- Movement by accelerometer or configured movement source is detected;
- Ignition (configured ignition source) is turned on.
# Ultra Deep Sleep mode
Conditions to enter ultra deep sleep mode, where GPS and GSM modem are turned off and device functions are suspended for maximum battery saving, are the same as entering deep sleep mode. FMB920 exits ultra deep sleep mode only when DIN1 and movement are detected by accelerometer. Movement source and Ignition source configuration is not taken into account in this case.