Bowers & Wilkins PI7 S2 In-Ear True Wireless Headphones | Noise Cancelling have the same audio quality as their respective predecessors and have an additional hour of battery life—five hours as opposed to the originals' four hours. Additionally, the Bluetooth range will be expanded: to 25 metres or more from the source. The Pi7 S2 supports a further function called Wireless Audio Retransmission that enables you to wirelessly connect to an external audio source, such as an in-flight entertainment system.