Amazon.com: HUAWEI E3372-325 LTE/4G 150 Mbps, Low Cost USB Mobile Broadband Dongle, Unlocked to Any Network (White) : Electronics
Amazon.com: Retevis Earpiece Adapter for Walkie Talkie,2 Pin to 3.5mm Headset Adapter Only Compatible RT22 RT21 RT27 RT7 H-777 H777S RT18 RT19 RT22S(Not Fit for Other Brand) 2 Way Radio (5 Pack) :
Amazon.com: Retevis Earpiece Adapter for Walkie Talkie,2 Pin to 3.5mm Headset Adapter Only Compatible RT22 RT21 RT27 RT7 H-777 H777S RT18 RT19 RT22S(Not Fit for Other Brand) 2 Way Radio (5 Pack) :
How to Secure your Huawei E5573 with a PIN Code - Enable PIN Code Protection on HUAWEI LTE Modem - YouTube