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There are 3 kinds of heartbeat Doppler processing modes: real-time FHR fetal heart rate display mode
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and then displays the default current of 400mA and flashes
Pick up music in 360 degrees
Outdoor Portable Multifunctional Battery Box 12V USB Output Emergency Power Supply Commercial Lighting There are 3 kinds of1. This smart battery box is made of impact resistant PP housing, which enables the battery box to withstand shock, impact as well as battery acid, gas, oil, dust and corrosion. 2. It is ideal for small boats, solar panels, electronic devices, camp lights and fridges. 3. It is suitable for all 12V batteries. 4. Carry it at any time, go out to use electricity, charge more conveniently, and monitor the voltage in real time. 5. Dual USB output,
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