Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
For Amazon.com's device with a weight of 221g (7.8oz) how many screen pixels does the device have?

### Inputs:
table_name: table, columns: ['Maker', 'Model', 'Intro year', 'Screen size (inch)', 'Self-lit', 'Screen type', 'Weight', 'Screen pixels', 'Touch screen', 'micro SDHC']

### Response:
SELECT Screen pixels FROM table WHERE Maker = amazon.com AND Weight = 221g (7.8oz)