Sennheiser ConC 400 Series Instruction Manual page 40

Specifications
40 | ConC 400
Bluetooth
Version
Transmission frequency
Modulation
Profiles
Output power
Codec
Device name
Number of active
connections
Bluetooth 4.2 compatible, class 1
2,400 MHz to 2483.5 MHz
GFSK, π/4 DQPSK, 8DPSK
A2DP, HFP
10 mW (max)
SBC
ConCPlus1
2