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Battery type electricity quantity display Wide application fields: lithium battery Using Method: connect display board positive and negative port with tested battery positive and negative port, digital tube will display real-time battery electricity quantity Digital Color: outline red, display block blue (when battery electricity quantity is full,it will be all on) Package included: 2Pcs 2S 8.4V Battery Capacity Indicator Module, 1Pcs 30cm/11.8inch Power Wire