iHeadBones Bluetooth (wireless) 501 Series

Speaker type: bone conduction metal can transducers
Bluetooth version: v3.0+EDR with Microphone
Bluetooth IC: ISSC 1681S with Noise and Echo Reduction, 4dBm Transmit and -91dBm Sensitivity
Compatible profiles: HFP, HSP, AVRCP, A2DP
Frequency response: 20Hz ~ 20kHz
Wireless range: 33 ft (10m)
FCC ID: 2ACP8-NICE2
Battery: rechargeable lithium ion
Continuous play: up to 6 hours
Standby time: up to 10 days
Charge in: 2 hours
Weight: 1.7 oz (43g)
Warranty: one year

iHeadBones wired, magnet free (non-magnetized) 201 Series

Speaker type: Ceramic Piezo Acoustic Device (WITHOUT MAGNETS)
Amplifier Type: Class D NJU 8764
Frequency response: 20Hz ~ 12kHz
Sensitivity: 100 ± 3dB
Battery: rechargeable lithium ion
Continuous play: up to 12 hours
Standby time: up to 10 days
Charge in: 2 hours
Headset Weight: 1.7 oz (43g)
Warranty: one year