@OP... Voltage is standard USB 5VDC +/-5% (4.75-5.25) but you can use as large a current rated power supply as you want, current is pulled by the device, not pushed, you can connect it to a 100 Amp power supply and it wouldn't draw more than ~1A because that's what it's designed to do. So using a higher current capacity adapter will not hurt the device.
Current Personal Phone: Google Nexus 4 (Stock KitKat KRT16S/AT&T GoPhone SIM)
Current Work Phone: HTC Rezound on VZW (S-OFF/CarbonROM
Current Tablet: iPad 4 and Nextbook 8 Premium with marxo's N8+ ROM - Revision 1b2 (ICS 4.0.4)
Previous/Retired Android Devices: HTC Aria, HTC Incredible 2, Samsung Stratosphere, HTC Rezound, Samsung Galaxy S2 Skyrocket