A 21-year-old man was assaulted and robbed of his wallet at gunpoint in Freeport after arranging to meet someone who had advertised on Facebook that he was selling calculators, Nassau County police said.

The victim, who police declined to identify, had made arrangements to meet with another man Saturday in front of 51 Shonnard Ave. to purchase 65 Texas Instrument TI-84 calculators for $1,000 in cash, authorities said.

As the victim waited in his car about 5:20 p.m., two men armed with a handgun entered his vehicle and demanded money. When the victim did not comply, the robbers took his wallet, and directed him to drive to 63 North Columbus Ave., where they parked, police said.

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The victim then supplied his bank account pin number after the subjects punched and threatened to shoot him. One of the robbers left the car and withdrew about $1,000 from the victim's account at an ATM, police said. The subjects fled on foot northbound on Columbus Avenue and eastbound on Parsons Avenue.

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Police said one suspect was armed with a black revolver. He was described as in his early 20s, 5 feet 11 inches tall, weighing between 140 and 160 lbs. with a messy beard and chipped or broken front teeth.

The other suspect was described as being in his late teens and about 5 feet 10 inches tall. Both were described as having thin builds, police said.

Detectives asked anyone with information regarding the crime to contact Crime Stoppers at 1-800-244-TIPS. All calls will be kept confidential.