The level of an alert a device is to sound. If this level is changed while the alert is being sounded, the new level should take effect.
The value of the characteristic shall be an unsigned 8 bit integer that has a fixed point exponent of 0.
The Alert Level characteristic defines the level of alert, and is one of the following three values:
• Value 0, meaning “No Alert”
• Value 1, meaning “Mild Alert”
• Value 2, meaning “High Alert”
The value 0x01 is interpreted as “Mild Alert”