Mark Howard believes United's unbeaten start to the season will be sending out a warning to League One rivals.
Ahead of the weekend, the Blades have won four and drawn six of the first ten League One contests and although the goalkeeper thinks that run should have yielded at least two more wins, he has been impressed by the character and determination the players have demonstrated:
"We were disappointed not to beat Notts County because we dominated the game; at Hartlepool we weren't as dominant but still created plenty of chances and thankfully we came away with all three points.
"The unbeaten start fills everyone with confidence and ultimately other teams must be noticing that we are difficult to beat and don't give anything away. We are capable of grinding out results and that gives us plenty to build on.
"There have been games we should have won which we have only drawn but with the strikers we have at the club we will turn a lot of those points into threes."
On Saturday's trip, United's London-born stopper added: "Going to Leyton Orient will be similar to many away games this season. They will want to try and stop us going forward and catch us on the break.
"As the Gaffer says, a lot of teams lift themselves against us but we are capable of handling the pressure and expectation.
"Orient have been in excellent form of late and their turnaround in results has come by scoring goals - Tranmere have proved what can be achieved if you score plenty."