Aposonic A-S1604R4 - Manual (Page 7)

USB Link, WIFI, Bluetooth, and Infrared).
c. Stop (Disable the image transmission methods, including
USB Link, WIFI, Bluetooth, and Infrared).
d. GPRS / 3G (Enable the image transmission method of
GPRS or 3G).
e. Change Channel (switch DVR channels).
Channel 1 (switch to channel 1)
Channel 2 (switch to channel 2)
Channel 3 (switch to channel 3)
：
：
Channel 16 (switch to channel 16)
Channel All (switch to 16 channel format).
Change Stream (Change DVR stream)