Streamlight Switch Assembly for Stylus Pro/MicroStream Pen Lights Black. The Streamlight 660023 is a on-off switch assembly which integrates with the Streamlight Stylus Pro and MicroStream Penlights. Our wide assortment of Streamlight replacement parts lets you switch out damaged or worn parts on almost any Streamlight Flashlight - so you can keep your Streamlight Stylus Pro or MicroStream Pen Light going strong for years to come Specifications for Streamlight Switch Assembly for Stylus Pro/MicroStream Penlights: Manufacturer: Streamlight Condition: New Features of Streamlight Switch Assembly for Stylus Pro & MicroStream Penlights Black: Replaces Power Switch Assembly for Stylus Pro and MicroStream Penlights Package Contents: Streamlight Stylus Pro/MicroStream Penlight Switch Assembly Black Streamlight Switch Assembly for Stylus Pro/MicroStream Pen Lights Black 660023