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3M Peltor WS ProTac headset differences between three of the models:

Feature **MT15H7AWS6** **MT15H7AWS6-111** **MT15H7BWS6-111**
**Mounting Style** **Headband** (Over-the-head) **Headband** (Over-the-head) **Neckband** (Behind-the-neck)
**FLX2 Accessory Jack** **No** **Yes** **Yes**
**External Audio Input** No Yes (via FLX2) Yes (via FLX2)
**Attenuation (SNR)** ~31 dB ~31 dB ~24 dB
**Weight (approx.)** 365g (without gel cushions) 373g (without gel cushions) Lighter neckband design
**Bluetooth** 4.2 Multipoint 4.2 Multipoint 4.2 Multipoint
**Battery Life** 45 Hours 45 Hours 45 Hours
**Microphone Rating** IP68 (Water/Dust proof) IP68 (Water/Dust proof) IP68 (Water/Dust proof)