Bowers & Wilkins PI7 review: What you need to know The Bowers & Wilkins PI7 and their cheaper siblings the PI5 are Bowers and Wilkins’ first pairs of true wireless earbuds. They’re also among the priciest buds around, which should come as no real surprise given Bowers & Wilkins’ audio pedigree and premium product line-up. The PI7 operate wirelessly over Bluetooth and make use of one of the newer iterations – version 5.0 – and can pair with three devices simultaneously. Codec support is extensive, with AAC, SBC, aptX, aptX HD, aptX Low Latency and aptX Adaptive all available to those with output devices that support them.