What Should I Look For When Buying A Pair Of Binoculars?

I'm buying a pair of binoculars as Viagra whithout prescription a birthday present, they will be used primarily for bird watching so need to be fairly lightweight, but what makes for a good pair

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Vivitar PV Series Bird Watching Binoculars    US $13.99

Zion PowerView 20x 280x60mm Military Super Zoom Binoculars Bird Watching Hunting    US $89.99

30 x 22 Compact Travel Bird Watching Binoculars US New    US $10.76

HQ Binoculars 20 x 70 Spy Military Grade Bino Sporting Game Bird Watching Tools    US $49.95

VISIONARY CLASSIC 8x40 BINOCULARS BIRD WATCHING NATURE    US $28.50

Zeiss 10x40 B T P Victory binoculars bird watching hunting FREE SHIPPING    US $712.00