Holux GM-305 - Manual (Page 11)

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(ii) Use a certified charger to ensure batteries are full charged.
(iii) Remove batteries from the cartridge when not use more than 30 days.
VI. EXTENSION ANTENNA ASSEMBLE & DISASSEMBLE
A. Remove rubber cover at right top side as Fig.2-4-1.
B. Connect active antenna with SMA connector to the unit.