Programmable linear charging current up to 1A Used for single cell 3.7V battery management, full 4.2V Constant current or constant voltage charging with over-temperature protection Soft start limits surge current, with battery reverse polarity protection Low power consumption standby to extend battery life Dual output of charging status, no battery and fault status display Can be activated at 0V, 2.9V trickle charging Working temperature -40-80 Input voltage range 4.2V-6.5V Output voltage 42V-28V adjustable Maximum power 5W DUE to Different Batches, The Apperance, Color and Printing of the Product May Be Different, which does not attract use. Colour:Black Material:PCB Package Contents: 10 x Battery Charger Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.