SMAKN&reg; 5V 2A Dual USB LCD all-in-one Boost Lithium ion Battery Charger Module Charging voltage input: 5V-6V 1A Stepup voltage output: 5V 1A/2.1A (Dual output, Total 2.5A) Protection circuit: Overcharge protection:4.250V Overcharge protection release: 4.100V Protection circuit: Over discharge protection:2.900V Over discharge protection release: 3.000V Idle time before LCD switch off: 60secs