User's Manual Part 1

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Chap3：Hardware layout
单位：mm
Chap 4 Annex
1、The power supply voltage is 5V, recommend the use 5V DC regulated power supply, power
supply ripple coefficient as low as possible, the module should be grounded reliably, and note
the positive and negative electrode of power source connected properly, such as reverse
connection may cause damage to the module
2、Antenna module near no obstacles, otherwise it will seriously affect the communication
quality