ACTi B21 - Manual (Page 9)

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Hardware Manual
9
Physical Description
B2x / I2x
B210
1) Memory Card Slot
Insert a memory card into this slot for local recording purposes. See How to Install /
Remove the Memory Card on page 26 for more information.
NOTE: Supports microSDHC and microSDXC cards.
2) Digital Input / Output (DI/DO) and Audio Input / Output
This connector connects to digital input or output devices, such as an alarm trigger, panic
button, etc., as well as audio input and output devices, such as microphones and speakers.
Digital Input (DI) and Digital Output (DO) devices are used in applications like motion
detection, event triggering, alarm notifications, etc. See Connecting the DI/DO and Audio
Devices (Optional) on page 15 for more information.