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Zello Walkie Talkie Wireless Bluetooth Handheld Speaker Mic, Two-Way Radio PTT Handheld Microphone with 3.5mm Universal Headphone Jack: Amazon.co.uk: Electronics & Photo
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Zello-The bridge between walkie talkie and mobile phone
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Amazon.com: Walkie Talkie Phones Zello PTT Button APP WiFi Mobile Radio 3G/4G Network 100 Miles Long Range Smartphone GPS Android KSUN ZL10 : Electronics
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Zello app turns your phone into a walkie talkie and lets you make calls when phone reception is poor | The Sun