JBL Free II Headphones

Bluetooth version: 5.0Speaker size (mm): 5.6Driver sensitivity at 1 kHz / 1 mW (dB): 100Speaker frequency response: 20 Hz - 20 kHzInput resistance (ohms): 16Weight (g): 61.6Bluetooth profiles: A2DP 1.3, AVRCP 1.5, HFP 1.7Bluetooth transmitter range: 2.4 GHz to 2.48 GHzBluetooth transmitter modulation GFSK: GFSK, π / 4-DQPSK, 8DPSKBluetooth transmitter power: