Embedded 3.7V/180mA Lipo battery．Charge automatically when receiver signal or 5-30V power connect to INPUT port. Recommended charge voltage is 5V.
Voltage Test Range:
0~30V, precision 0.05V. When internal battery test, precision is 0.005V
Receiver Signal test Precision：
10~99999, Precision: 0.05%, test distance range 5cm-15cm.
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