Main Function:<br />1. When testing full power (> 3.6V) 2S (7.2V) Li-Polymer battery 2 green LED keeping light<br />2. When testing full power (> 3.6V) 3S (10.8V) Li-Polymer battery 3 green LED keeping light<br />3. When testing full power (> 3.6V) 4S (14.4V) Li-Polymer battery 4 green LED keeping light<br />4. When voltage <br />    Specifications<br />Specifications<br />  Type: Batteries                                                  <br />                        Feature: Tools/accessories of radio control series toy                                                 <br />Dimension and Weight<br />  Product Weight: 0.006 kg                                                  <br />                        Package Weight: 0.026 kg                                                  <br />                        Product Size (L x W x H): 4.2 x 2.6 x 1.2 cm / 1.7 x 1.0 x 0.5 inches                                                  <br />                        Package Size (L x W x H): 7 x 5 x 2 cm                                                 <br />Package Contents<br />  Package Contents: 1 x Dual Speaker Low Voltage Buzzer BB LED Annunciator                                                 <br /><br /><br /><br />                                                <br />