This is the newer style of black housing HC-2802HL-PR3 Tranquil heat and massage hand control used by Pride, Mega Motion, and several other manufacturers.
It has a lock/unlock button that lights up when locked and has timing and intensity functions.
Hand control raises the chair to and lowers the chair from the standing and recline positions, and controls the heat and massage settings.
The interactive LEDs light up to indicate which massage or heat settings have been selected.
NOTE: It has a nine (9) pin plug that plugs into a control box under the chair. If your control looks like the one pictured, it will be the correct one.