Motorola PRIVACY PLUS B7 - Manual (Page 21)

Low-Battery Alert (Programmable)
The radio will emit an alert tone to indicate a low-battery condition if the
battery voltage falls below the low-voltage level. When the radio is transmitting,
the tone is emitted when the PTT is released; when the radio is receiving, the
tone is emitted when the low-battery condition is detected.
Variable RF Power Level
VHF and UHF radios can have more than one power level. High power can be
programmed on those modes where the frequency is licensed for high power, and
low power can be programmed on all other modes.
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19 General Radio Features Operation