This is specially designed for Ubibot series products-GS1. It is 1 male to 2 females, 3.5mm audio jack connector.
By using either of them, you can connect more than one external probes at a time, such as Soil Sensor, PT- 100 probe, TH30S-B probe, etc.

Item Weight 13g
Cable Length 36cm
Material Copper wire
Connector Audio Plug