Sonic lipstick

"Sonic Lipstick - Never leave home without it."

- Sarah Jane Smith

The sonic lipstick was a device regularly employed by Sarah Jane Smith similar to the sonic screwdriver owned by the Doctor, while resembling a real lipstick closely enough not to seem suspicious.

History
The Doctor had left the sonic lipstick for Sarah inside a sliding panel on the side of K-9 Mark IV. (Sarah Jane Adventures website)

Apparently either the Doctor left her a spare, or she obtained/constructed another, as following the destruction of one of the devices by Sontaran Commander Kaagh, she later produced another. (SJA: Enemy of the Bane)

Features
It generated a pinkish-red light when used. Like the Doctor's sonic screwdriver, it also remained ineffective against deadlock seals. The Slitheen described it as a sonic disruptor. (SJA: Revenge of the Slitheen) However in the episode "The Eternity Trap" it was able to open a wooden door when it was locked. This is different to the Doctor's sonic screwdriver because that "can't do wood" (DW: Silence in the Library)

Uses
Sarah Jane had used it to open and close doors, send an electrical charge, and cut cables. She claimed she could destroy the Gorgon's portal key with sonic disruptions from the lipstick, but this may have been a bluff. (SJA: Eye of the Gorgon)

She later used it to interfere with Mr. Grantham's comms device causing a very high-pitched noise. (SJA: Warriors of Kudlak) She does this again to UNIT soliders. (SJA: Enemy of the Bane)

Sarah Jane used the device to get through a door and escape the testing of the reality bomb. (DW: Journey's End)

She disables a cloaking field on a sontaran ship. (SJA: The Last Sontaran)

Sarah Jane destroyed two sphere-shaped drones. (SJA: The Last Sontaran)

De-activated Kaagh's control device. (SJA: The Last Sontaran)

She uses the lipstick to cut a piece of meteorite and later shatters a glass mirror. (SJA: The Day of the Clown)

De-activated robot clowns. (SJA: The Day of the Clown)

Used it againts an alien life form, but its unknown what the sonic lipstick actually does to the alien life form. (SJA: The Mark of the Berserker)

Sarah Jane disables her parents car engine. (SJA: The Temptation of Sarah Jane Smith)

Disrupts Earpieces causing great pain. (SJA: Enemy of the Bane)

Mark II
The Mark I was destroyed by commander Kaagh standing on it. (SJA: Enemy of the Bane) Then Sarah Jane Smith had another Sonic lipstick in her bag, using it destroy the Tunguska Scroll and indicating that a girl can have more than one lipstick. It's unknown if the Doctor built more than one or if Sarah (perhaps with the help of K-9 or Mr Smith) made a duplicate.

Uses
Destroyed the Tunguska Scroll. (SJA: Enemy of the Bane)

Teleported a Slitheen back to its home. (SJA: From Raxacoricofallapatorius With Love)

Destroyed a communication system. (SJA: Prisoner of the Judoon)

Smashed glass. (SJA: Prisoner of the Judoon)

Use it to release the Nanoforms into the genetic system. (SJA: Prisoner of the Judoon)

Used it to lock on the Nanoforms to Clyde and Rani. (SJA: Prisoner of the Judoon)

Used it to break into a theme park. (SJA: The Mad Woman in the Attic)

Used it to open the door in the nursery. (SJA: The Eternity Trap)

Used it to try and disable the machine the Slitheen built. (SJA: The Gift)

Behind the Scenes

 * Character Options released a Sonic Lipstick replica featuring lights and sounds. The toy was slightly different from the original, in that the ridges in the actual prop are less deep (SJA: Revenge of the Slitheen, The Last Sontaran) and the coat was shiny metal rather than bland brown plastic (SJA: Revenge of the Slitheen, The Last Sontaran)
 * The origin of the sonic lipstick, while given on the SJA website, is not mentioned on screen. The closest reference occurs in Invasion of the Bane when Sarah Jane invokes the Doctor's name when using the device.
 * It's been hinted by many fans that her sonic lipstick went redder when Androvax was inside Sarah Jane.