Feature: 1. Bridge Plate: This Watch Has An Empty Bonding Pad On The Back. For Example, If You Weld The Iic Pad, The Watch Might Turn Into A Wifi Duck. Note: The ESP8266 only supports 2.4GHz. 3dB External Antenna: The V4 programmable watch is designed with a 3dB external antenna, improving signal detection and coverage for analyzing WiFi signals from a greater distance.
eBay