A well-dressed suspect sneaked into a Mount Eden apartment and walked out with pricey electronics, said law-enforcement authorities. The man, wearing a suit and tie, entered an apartment building on Eastburn Avenue near East 175th Street at about 11 a.m. on Jan. 29, cops said.He was holding a note pad and had an unknown ID card dangling from a lanyard around his neck, cops said. He slipped into an apartment, which may have been left unlocked by the 38-year-old tenant, and scooped up two laptop computers and a tablet computer worth a total of about $1,200, cops said. The burglar is believed to be in his late 20s or early 30s and 5-foot-7.

A suspect was arrested in the brutal slaying of an elderly man in the South Bronx last month, police said. Arnell Jones, 54, is believed to have robbed and killed 68-year-old Eric Simmons of Sedgwick ­Avenue in the Melrose Houses on Jan. 28, cops said. Simmons was found with massive head trauma in a stairwell of the complex on East 156th Street at about 1 p.m. He was unconscious when EMS arrived at the ninth-floor landing and was pronounced dead at the scene. Investigators believe that Jones may have been carry­ing between $1,400 and $1,700 when he was robbed and killed. No money was found on the body, and no weapon has been located.

A 13-year-old punk robbed a fellow teen in Williamsburg after “borrowing” the victim’s cellphone and then threatening him when the kid asked for it back, cops said. The 14-year-old victim was at Grand and Humboldt streets at approximately 3 p.m. on Feb. 4 when the bully asked to use his Samsung Galaxy S3 phone, police said. The teen handed over the device, and the thief turned and began walking away with a pal, the sources said. When the victim followed the punk and asked for the phone back, the suspect allegedly snarled, “I’m going to poke you.” It wasn’t immediately clear if the suspect had a weapon. The victim’s mother took him to the 90th Precinct station house to report the crime, but the kid said he was unable to provide a description of the suspect.

A police impersonator has robbed at least seven livery drivers at gunpoint after hailing rides from JFK Airport, cops said. In each incident, the suspect would go to the airport, get into a livery car and pull a gun. He would display a badge, announce that he was a cop, demand cash and flee with the dough. He held up the first hack at about 10:25 p.m. on Feb. 2 and made off with $250, authorities said. On Feb. 4 at 3:20 a.m., he robbed a driver of a GPS device and $100, cops said. Two hours later, the armed thief robbed a driver of $30 and a Samsung cellphone, cops said. For his third robbery that day, he held up a hack at 226th Street and 147th Avenue at about 9 p.m., making off with $180 and credit cards, police added. He struck again on Feb. 5 and then two days later, and most recently on Monday, cops said. He managed to get credit cards, an iPhone and $400 total from his most recent three heists, cops said. The suspect was generally described by the victims as about 5-foot-10 and 160 pounds, said law-enforcement authorities.

Cops say they’re hot on the trail of a chilled bank robber who bundled up before bungling an attempted heist at a branch in Gramercy, said law- ­enforcement authorities. The suspect was wearing a dark-colored winter hat with ear flaps, a gray scarf, a winter jacket and tan boots when he approached the teller in the HSBC branch on Sixth Avenue near West 27th Street at approximately 8:45 a.m. on Feb. 5, cops said. He passed a note demanding cash through the window slot, but the intrepid teller rebuffed his demand and he turned tail and ran, cops said.