Ruiwaer 4PCS 18650 Lithium Ion Battery Charging Module Electronics Power Converters Suitable for Multimeter

["The product must be calibrated before use. The default output is approximately 9V, with an input voltage of 4.5-8V and a continuously adjustable output voltage of 4.3-27V.","The product's charging voltage is 4.2V, with a maximum charging current of 1A and a maximum discharge current of 2A.","Product dimensions: 3.3x2.3x0.9 cm/1.3x0.91x0.35 in","The product can be used with a multimeter to charge lithium-ion batteries.","Package contents: 4 pieces 18650 lithium-ion battery charging modules"]