From Fogdog:

Star Trac 4530 Commercial Treadmill with Polar & Contact Heart Rate Monitor
Features and Benefits

• Horse Power Rating : 2.5 Continuous Duty--This is the amount of continuous motor power that is consistently delivered during heavy usage over an extended period of time.
• Shock Absorption: Star Trac Impact Absorption System--Maximizes comfort and safety with dual-cavity, high density neoprene cushions along both sides of the deck to help protect your joints and ligaments.
• Double Sided Deck--The treadmill deck is coated on both sides allowing you to flip the deck over, should one side become worn-out.
• Heart Rate Monitor: Contact Heart Rate and Dynamic Heart Rate Control™ w/ Polar® Telemetry --Provides an accurate heart rate and automatically adjusts the intensity level based on the user's heart rate to keep them in their target zone.

• Maximum User Weight: 350 Pounds
• Overall Length: 81 Inches
• Overall Width: 33 Inches
• Minimum Speed: .5 Miles Per Hour
• Maximum Speed: 10 Miles Per Hour
• Incline Minimum: 0 Percent
• Running Surface Length: 62 Inches
• Running Surface Width: 20 Inches
• Power Incline --
• Deck Material: Wax Treated Composite Fiberboard

From Fogdog:

Star Trac 901 Home Treadmill w/ Polar Heart Rate Monitor
Features and Benefits

• Horse Power Rating : 2.0 Continuous Duty--This is the amount of continuous motor power that is consistently delivered during heavy usage over an extended period of time.
• Shock Absorption: Star Trac Impact Absorption System--Maximizes comfort and safety with dual-cavity, high density neoprene cushions along both sides of the deck to help protect your joints and ligaments.
• Double Sided Deck--The treadmill deck is coated on both sides allowing you to flip the deck over, should one side become worn-out.
• Workout Programs: Star Trac TR901--Pre-programmed training courses, including 5K and 10K race programs, progressive hill programs, and a varied-profile program that generates 250 different workouts to help keep your workout fresh and exciting.
• Display Panel: Time, Distance, Speed, Calories, Laps, Pace and Heart Rate--These readings allow you to measure your progress during exercise so that you can meet and exceed your fitness goals.

• Maximum User Weight: 300 Pounds
• Overall Length: 69 Inches
• Overall Width: 28.5 Inches
• Minimum Speed: .5 Miles Per Hour
• Maximum Speed: 10 Miles Per Hour
• Incline Minimum: 0 Percent
• Running Surface Length: 53 Inches
• Running Surface Width: 19 Inches
• Weight of Machine: 250 Pounds
• Power Incline --
• Deck Material: Wax Treated Composite Fiberboard

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