The battery depletes within a few days - Please confirm whether the firmware is up to date. - In locations with very poor reception, transmission and location positioning times will increase, thus as a result battery run time may become much shorter than expected. - For Gen2 devices, check if the regular transmission interval is in short intervals. It is recommended to set it to at least 180 minutes unless absolutely necessary. - If the operation time has decreased suddenly, there might be a chance of battery failure. The LED is constantly on (blue, red, purple) - The LED lights up during USB charging. It flashes blue during alarm activation, positioning, and communication. - If the LED is constantly on (blue, red, purple) when not charging, the device may be faulty. The LED does not light up red or blue while charging - Try using a different USB cable or flip the direction of the connector. - If you are using a portable charger, charging may stop near full charge and the LED will turn off. This is a common behavior of when charging with portable charger.. The LED does not flash when pressing the button during device registration - Charge the device first and then unplug the USB cable. Then, pressing down the button firmly for more than 3 seconds will make the LED flash. - Next, press and hold the AlterLock device button for more than 10-15 seconds to restart the device. The reboot will complete in a few seconds. - If the issue persists after restarting, the device may be faulty. No alarm sound - The alarm activates after the device is set to Lock mode and a certain level of movement is detected. However, the alarm might not sound due to the following settings or conditions: - The alarm setting is turned off. - The "Alarm Limit" set while in the Lock mode has been exceeded. - The mobile phone's battery is low, and the alarm has been automatically turned off. - Right after setting to Lock mode. *After setting to Lock mode, a stationary state of about 1-2 seconds is required for the alarm to sound properly. If none of the above apply or the volume has become extremely low, the device might be faulty. If you suspect a fault based on the above symptoms, please check the warranty period and apply for an exchange via the contact form by selecting "Return/Exchange" > "Exchange".