The CG1000 is the only spy camera glasses on the market that that feature an interchangeable battery system. The glasses arm is removable and has a built-in lithium ion battery; two batteries/arms are included with your purchase (additional batteries can be purchased). The battery lasts for about 60 minutes of recording; when the battery runs out simply plug in another battery to continue recording.
They offer clear 1080P HD video while still being amazingly discreet and low-profile. The actual camera portion of the glasses (located between the lenses) is nearly undetectable.