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Garmin Forerunner 405 vs Garmin Forerunner 405CX

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

GarminForerunner 405GarminForerunner 405CX
Overview
ReleasedApril 20082009
Display
Case sizes48 mm47.75 mm
Always-on displayYesYes
Display detailBacklit monochrome screen, 1.06-inch diagonal and 124 × 95 pixels; a touch-sensitive bezel and two buttons control the watch. Panel technology is unpublished in the maker's specification.Backlit monochrome screen, 27 mm diagonal and 124 × 95 pixels; touch-sensitive bezel and two buttons. Panel technology is unpublished in the maker's specification.
Health and fitness
ECGNoNo
Blood oxygenNoNo
Skin temperatureNoNo
Sleep apnoea alertsNoNo
High blood pressure alertsNoNo
Body compositionNoNo
Fall detectionNoNo
Crash detectionNoNo
GPSSingle-bandSingle-band
SensorsHigh-sensitivity GPS receiver; optional ANT+ heart-rate chest strap, foot pod and cycling speed/cadence sensor. No optical wrist sensor.High-sensitivity GPS receiver with HotFix; ANT+ heart-rate chest strap, optional foot pod and cycling speed/cadence sensor. No optical wrist sensor.
Fitness featuresPace, distance, time, calories, custom and interval workouts, Virtual Partner, Auto Lap and Auto Pause.Heart-rate-based calorie calculation developed with Firstbeat; custom and interval workouts, courses, Virtual Partner, Auto Lap, Auto Pause, Auto Scroll and configurable training screens.
Safety featuresStores up to 100 locations and provides direction to a saved location; no base maps.Up to 100 stored locations and navigation to a saved location; no base maps.
Battery and connections
Battery life (maker's claim)Up to 8 hoursUp to 8 hours
In low-power modeUp to 14 daysUp to 14 days
Mobile data optionNoNo
Works withNo phone pairingNo phone pairing
Battery life detailRechargeable lithium-ion battery; approximately eight hours with GPS or two weeks in power-save mode.Rechargeable 300 mAh lithium-ion battery; up to eight hours with GPS or two weeks in power-save mode, according to the English owner's manual. Garmin Slovakia instead quotes nine GPS hours.
ChargingContact charging clip and AC adapter.USB contact charging clip and AC adapter.
ConnectivityANT+ Sport wireless data transfer to a computer through a USB ANT stick; Garmin Connect and Garmin Training Center analysis. No direct phone pairing.ANT+ computer transfers through a USB ANT stick; Garmin Connect and Garmin Training Center. No direct phone pairing.
StorageAround 1,000 lap records; Garmin Taiwan quotes approximately twenty hours of track points at one point every four seconds.Up to 1,000 laps, 100 locations and approximately twenty hours of track points at one point every four seconds.
Design
Weight (lightest version)60 g60 g
SoftwareGarminGarmin
Case materialsIPX7 immersion protection, one metre for thirty minutes; not intended for swimming.IPX7 immersion protection, one metre for thirty minutes; the manual says the watch is not intended for swimming.
Size48 × 71 × 16 mm; approximately 60 g. Width is used as the case size; the English manual instead lists 47.75 × 70.5 × 16.4 mm.47.75 × 70.5 × 16.4 mm and 60 g, according to the English manual; Garmin Slovakia rounds this to 48 × 71 × 16 mm. Width is used as the case size.
Bands–Standard wrist strap and two additional form-fitting fabric straps for smaller or larger wrists.
Colours–Deep blue.
In the boxWatch, USB ANT stick, AC charger and manual; heart-rate strap included in some bundles.Watch, heart-rate chest strap, USB ANT stick, AC adapter, USB charging clip, additional wrist straps and documentation.

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