RLN6490A RLN6490 - Motorola XBT Operations Critical Wireless Behind-the-Neck HeadsetRLN6490A RLN6490 Motorola XBT Operations Critical Wireless Behind the Neck Headset 23dB Hearing Protection, Battery Life (typical, 5 5 90): 22 hours, Charge Time: 7 hours, Lithium Polymer Battery. XPR 6100, XPR 6300, XPR 6350, XPR 6380, XPR 6500, XPR 6550, XPR 6580 requires adapter: PMLN5712 or PMLN5993 (not included). SL 7500 Series, XPR 7000 Series and XPR 5000 Series radios have Bluetooth audio embedded in the radio and do not require a separate