Voice Commentary; Backlight; Battery Low Indicator; Microphone Care - Batbox Duet User Manual

Do not turn the volume up too high, with headphones, as you may
not be able to hear people and things around you. In some circumstances
this may put your personal safety at risk, especially near roads, at night.
Before inserting headphones into the headphone socket, make sure
that the volume is turned down. When the volume control is set high,
the headphone level may be too great for comfort.
Higher levels should only be used for listening to distant bats.

VOICE COMMENTARY

By pressing the 'Ref' button, during recording voice commentary can
be added to recordings e.g. Date, time, place, conditions etc. Voice
recording is routed to the left channel of the tape socket, in place of the
frequency division. When the button is released, the Duet will return to
normal, dual channel recording. The heterodyne output is unaffected by
the 'Ref' button.
The unit should be held between 10 and 25 centimetres from your mouth
and better quality voice recording will be obtained by talking across the
microphone, rather than into it. This will allow undistorted commentary
and ensure that no moisture enters the microphone.

BACKLIGHT

The backlight behind the LCD display will not be apparent in daylight but
as light levels go down, sufficient light to read the display will be apparent,
without being so bright as to spoil night-vision.

BATTERY LOW INDICATOR

When the battery voltage drops below 7 volts a 'BAT' legend will
appear in the top left hand corner of the display. The Duet will continue
functioning normally for a few more minutes.
When turning on the unit, if the battery output is below 7 volts, as well as
the BAT indicator, the display will flash 'LobA' for 5 seconds, and then
display 0 kHz. At this point, the audio output of the Duet may still be
heard, even though the display reads 0 kHz. However, you should renew
the battery at this point, in order to maintain proper functioning of the
detector.

MICROPHONE CARE

The ultrasonic microphone, situated at the front of the Duet is a very
sensitive device and should be treated with the same respect as a camera
lens. Do not allow any ingress of moisture or excessive dust.
Do not use the Duet in rain, unless under cover.