The 4 wire JST-SH is used on some control boards to access UARTs or make receiver connections. It's the smallest connector type currently used in the hobby. Please note there is no wiring standard for this connector i.e. the red wire is not necessarily 5V, the black wire is not ground and so on. You MUST check your control board and connect as appropriate. The leads can easily be removed and reinserted into the connector to match your application.
Silicone wires, 10cm long.