DROK USB Universal Charger DC 3V to 5V/1A Power Converter Boost For DIY Mobile Phone/MP3/MP4 Modules nature:Non-synchronous rectification Non-isolated Boost Input voltage: DC 2.5V to 5V Output voltage: DC 4V to 12V (adjustable, default 5V) Output current: 1000mA (max) Output ripple: 20mV (max)