In previous versions, encryption wasn't required and could be turned off, and usage of expired keys could be easily attacked. Improved pairing security and experience with Secure Simple Pairing (SSP).Unicast Connectionless Data for small amounts of service data without an L2CAP channel.Enhanced Retransmission Mode (ERTM) for L2CAP supports retransmission and flow control, and a low-latency Streaming Mode (SM) support neither.Enhanced Power Control improves power management and fixes some headset link loss issues.Note that HS is an optionally supported feature. High speed data transfers of up to 24 Mb/s using a colocated 802.11 (Wi-Fi) link.An entirely new stack called Bluetooth Low Energy was built to target very low power applications powered by a watch battery.Audio Architecture Updates for HD voice quality.
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