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Polarization protected DC input. Voltage range between 3.3 and 5.5 VDC using an ultra lownoise TI LDO. Embedded surface mounted Seiko high quality rechargable Manganese-Silicon lithium battery for minimizing startup time (cold start) and to maintain saved settings. The module includes an embedded charger circuit for the battery... The GPS breakout board strictly follows the GlobalTop design rules to ensure perfect module performance in all aspects with or without an external antenna. This includes EMI and voltage ripple reduction.