This is a Reedy 2S RX/TX Pro Charge Lead, an ideal solution for charging receiver batteries through the balance lead instead of unplugging the battery to charge. An extra-long length of 80cm (31 1/2") offers added convenience for nitro racers. This lead works with TX batteries too. Reedy's Pro Charge Leads are now available in a variety of configurations for most batteries used in popular 1:10 and 1:8 applications! Heavy-duty 12-gauge silicone wires provide maximum current flow without overheating during high-current cycling. Mesh sheathing offers additional protection and a professional appearance while positive ends are clearly marked to prevent reverse polarity.