It should work for the iPhone 4 fine, but it would be fairly slow charging the iPad.
iPad 1 64gb 3g, iPad 3 64gb LTE, iPhone4 32gb, iPod Touch 32gb, Classic iPod 30gb, AppleTV 1g and 2g, MBP 13", MAC Mini
Here's where you can download the iPad manual.
Be careful of these things...I ordered one charger and it wouldn't take a charge from the sun, I sent it back and they sent me another that wouldn't even take a charge from a wall outlet. Most personal solar chargers are a scam...which is really sad!