Spektrum SPM1305 - Manual (Page 15)

15 SPEKTRUM TELEMETRY
Signal and Battery Voltage
Signal strength and battery voltage is built into the telemetry module
and no further attachment of sensors is necessary. The telemetry module
must be properly hooked up to the receiver, and with the handheld unit
and receiver bound together. Signal strength and battery voltage will
be displayed when the receiver and handheld units are turned on.
Signal Lap # Lap Time
Speed/RPM Voltage Temperature
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Note: The voltage displayed is the receiver voltage. This
is especially useful for nitro cars in alerting you to change
your receiver pack before your vehicle goes into failsafe due
to low battery pack voltage. If you wish to monitor another
voltage source (like the drive batteries in an electric car), a
voltage harness is provided. The voltage harness replaces the
telemetry lead and the open wires must be attached (soldered)
to the desired voltage source that you wish to monitor.
Note: The source must be above 3.2 volts.