Supplying power
The H4essential can operate using batteries or a power supply connected to the USB port (AC adapter, USB
bus power or portable battery).
Power from a power supply connected to the USB port will be used before batteries.
Installing batteries
Use 4 AA batteries when operating the H4essential on battery power.
1. When the power is off, push the latch up to open the battery cover.
2. Install 2 AA batteries.
3. Replace the battery cover.
NOTE
• Use only one type of battery (alkaline, NiMH or lithium) at a time.
• Set the type of battery used correctly so that the amount of remaining battery charge can be shown
accurately. (→ Setting the type of batteries used)
• If the batteries run out of charge, turn the power off immediately and install new batteries. The battery
charge will always be shown when operating on battery power.
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