Description Features: 100% Brand New and High Quality Can be used for multimeter, converted to lithium battery charging For example: VIN Port input 5V solar panels, BAT port can output 4.2V to charger 3.7V 18650 battery Note: The OUT Port can output an adjustable voltage. Specifications: Input voltage: 4.5-8V DC Output voltage: 4.3-27V DC (Continuously adjustable) Charging voltage: 4.2V DC Charging current: Max. 1A Discharging current: Max. 2A Size: 3.3×2.3cm/1.3×0.91″ Quantity: 1 Pcs Package Contents: 1 x Step Up Boost Module