Features:Can be used for multimeter, converted to lithium battery chargingFor example: VIN+Port input 5V solar panels, BAT+port can output 4.2V to charger 3.7V 18650 batteryNote: The OUT+Port can output an adjustable voltage.Specifications:Input voltage: 4.5-8V DCOutput voltage: 4.3-27V DC (Continuously adjustable)Charging voltage: 4.2V DCCharging current: Max. 1ADischarging current: Max. 2ASize: 3.3x2.3cm/1.3x0.91"Quantity: 1 Pcs