The BC127-EXT-APTX_1103783 from Sierra Wireless is a Bluetooth v4.2 transceiver module operating at 2.4 GHz to 2.48 GHz, with the antenna not included and castellation surface mounting.
The BC127-APTX_1103708 from Sierra Wireless is a Bluetooth v4.2 transceiver module operating at 2.4 to 2.48 GHz, with an integrated chip surface-mount design.
The BC127-EXT-HD_1103784 from Sierra Wireless is a Bluetooth v4.2 transceiver module operating at 2.4 GHz to 2.48 GHz, with the antenna not included and castellation surface mounting.
The BC127-HD_1103709 from Sierra Wireless is a Bluetooth v4.2 transceiver module operating at 2.4 to 2.48 GHz, with an integrated chip surface-mount design.