1.Digital lithium battery protection board 2.OEM 3.2pcs tact switch 4.Digital display 5.8.5V over-charge protection ModelCV55CategoryAir ... : 1pc 7-segments digital LED; 2pcs tact switch(on/down, off/up); 1pc 3.6mm DC block, charge and discharge are for ... output, LED displayed the number '5'.(3) Adjust the output voltage increases operation: press tact switch 'UP', LED displayed value decrease, output ...