The information you requested is being forwarded to you under separate cover.

现另函寄上所要资料。

《牛津词典》

In order to promote business between us, we are airmailing you samples, under separate cover, for your inspection.

为促进双方业务往来，另封航邮寄上样品，供你参考。

youdao

To give you a general idea of our products, we are sending you under separate cover a catalogue together with a range of pamphlets for your reference.

为使贵方对我方产品有全面的了解，我方另函寄去一本目录册及一套小册子，供参考。

youdao

So, perhaps we'll see HTC introduce a separate cover to make inductive charging possible.

ENGADGET: Droid Incredible 4G LTE review: Verizon gets an excellent smaller-sized Android phone

Under separate cover, Arianda sent her own letter, with a drawing of the American and the Ukrainian flags.

NEWYORKER: The Natural

Like the solar cover, it is separate from the core tablet but connects via a port.

FORBES: A Look At OLPC's XO 3.0 Tablet's Solar And Kinetic Chargers