Safe and non-invasive: User Manual: Each monitor includes a user manual with detailed instructions. Included: - Back-lit LCD and digital display - Power, volume and mode buttons - Loudspeaker for listening and recording to your own devices - Standard 3.5 mm audio jack - Detection probe - 3 AA batteries - User manual Ideal usage time 16 weeks: Although it is possible for a monitor to detect a heartbeat as early as 8 to 10 weeks, ideal usage should begin around 16 weeks. As the baby matures, it will become easier and easier to detect the heartbeat. Lubricating Gel: For best results, use of a lubricating gel is highly recommended (Not included). The more gel used, the less static you will hear. Guarantee: BabyWhisperTM Heartbeat Monitor is backed by an UNCONDITIONAL MONEY BACK GUARANTEE. Please contact us through your Amazon account if you have any questions. NOTE: BabyWhisperTM Heartbeat Monitor is a amplifier listening system to hear the sounds your baby makes and NOT a medical diagnostic device. Use of the device should never substitute regular prenatal care by a licensed practitioner.
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