USB Power Bank Circuit Board 134N3P Lithium Battery Charge Boost Module 3.7V-5V
Model: 134N3P. 1 x USB Power Bank Charging & Boost Circuit Board (134N3P). Features built in protection and high efficiency power conversion perfect for portable USB charging projects. Discharging Efficiency: ~85% (Input 3.7V, Output 5V @ 1A).