FUTABA 12K Instruction Manual page 105

TELEMETRY : EXT-VOLT
The EXT-VOLT screen will display the data from
the EXT-battery output from the R3008SB receiver.
In order to use this function, it is necessary to
connect external voltage connector of the R3008SB
receiver to a CA-RVIN-700 (FUTM5551) or
SBS-01V to the battery you desire to measure the
voltage of.
RTN
HOME/EXIT
RETURN
Alert set
*When the RTN button is pushed for one second, the rate is
reset to the initial value.
*CA-RVIN-700 or SBS-01V must be installed in the aircraft.
You will be alerted by an alarm or vibration if
the voltage set by you is exceeded.
*It cannot be used in S-FHSS mode
If the following types are selected, the transmitter will
vibrate during the warning.
TYPE 1
TYPE 2
TYPE 3
TYPE 4
<Functions of Linkage Menu>
<Push Dial>
"Vibes" type
105