Shure AONIC 215-BL True Wireless, Bluetooth Earphones, Dynamic SE215 in-ear earphones with a RMCE-TW1 Bluetooth adapter, 1-Way earphones, Sound isolating technology blocks up to 37 dB of background noises, Switchable Environment Mode allows you to hear the external world at the touch of a button, In-ear design, Impedance: 20 Ohm, Frequency range: 22 - 17,500 Hz, Sensitivity: 107 dB SPL / mW, Battery life of up to 8 hours, Transport case with charger provides up to 3x usual battery life, Working range of up to 10 metres, Bluetooth 5.0, Complementary ShurePlus PLAY app for EQ, Environment Mode and adjusting the volume, Colour: Blue, Includes a transport case with charging function, USB-C cable for connecting to the charger, Soft Flex ear sleeves (S, M, L) and foam ear sleeves (S, M, L)