Job Link� System Wireless Transmitter - The JL2 Transmitter receives measurements from any Fieldpiece wireless manifold (SMAN4, SMAN440, SMAN460) the Fieldpiece wireless dual in-duct psychrometer (SDP2) and wireless clamp meters (SC460 & SC660) via radio frequency for extra distance - up to 100' from instrument to phone. Then the JL2 transmitter converts all live measurements and data to bluetooth connection with your mobile device.