Check the listing for details. 2 PCS DC1.5V- 5Vto 4.2V Boost Charger module & 0.9-5V to 5V DC DC Step-up. Condition: New. Listed at 4.99 USD. Product Name: 2 PCS DC1.5V 3V 3.3V 3.7V 5Vto 4.2V Boost Charger module & 0.9-5V to 5V DCDC Step-up Packing list: 2 PCS DD05CRTA 2 in 1 DC 0.9-5V to 4.2V 5V Boost Charging board Description: DC 0.9-5V Boost Lithium Battery Charger Module - Linear charging. Input voltage 0.9-5V Output_1 : DC 4.2V/0-1A, as battery Charger Maximum charging current : 1000MA Full charge voltage : 4.2V+-2%. Led indicator : "OK" LED is fully charged OR battery failure status indicator; "CR" LED is charge status indicator Output_2 : 0.9-5V to 5V Step up module Start Voltage 0.9V, Output Current 1MA INPUT 1.2V/0.23A, OUTPUT_2 5V/0.04A; INPUT 1.5V/1.24A, OUTPUT_2 5V/0.25A; INPUT 1.8V/1.24A, OUTPUT_2 5V/0.35A; INPUT 2.5V/1.22A, OUTPUT_2 5V/0.52A; INPUT 3V/1.22A, OUTPUT_2 5V/0.65A; INPUT 3V/1.5A, OUTPUT_2 5V/0.75A; INPUT 3.3V/1.23A, OUTPUT_2 5V/0.72A; INPUT 3.3V/1.5A, OUTPUT_2 5V/0.84A; INPUT 3.7V/1.2A, OUTPUT_2 5V/0.8A; Operating ambient temperature : -40° to +85° Storage temperature : -65° to +125° Size : 32.1x16.2x5.7mm Weight : 2.3g Can be used DC 0.9V-5V power supply charger(Such as Solar panels)Charging module comes with charge-management functions, will not overcharge or over discharge Comes with rechargeable function,Will enter standby mode when fully charged.When the battery capacity is below 80%, the charging start. Applications: Battery pow ered equipment Lithium Battery 18650 Mobile phone Solar charging MP3/MP4 player Audio equipment Portable Devices Bluetooth Applications Wifi Applications