Garmin Forerunner 405 vs Garmin Forerunner 70

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

Only show differences

Better figure, where one is clearly better

Share comparison

Forerunner 405 compared with Forerunner 70

	GarminForerunner 405	GarminForerunner 70
Overview
Released
Released	April 2008	May 2026
Display
Case sizes
Case sizes	48 mm	42.6 mm
Panel
Panel	–	OLED
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	Backlit 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 Panel technology is unpublished in the maker's specification.	1.2-inch (30.4 mm diameter) colour AMOLED touchscreen, 390 x 390 pixels; optional always-on display and large-font setting; five physical buttons
Screen protection
Screen protection	–	Chemically strengthened glass
Health and fitness
ECG
ECG	No	No
Blood oxygen
Blood oxygen	No	Yes
Skin temperature
Skin temperature	No	No
Sleep apnoea alerts
Sleep apnoea alerts	No	No
High blood pressure alerts
High blood pressure alerts	No	No
Body composition
Body composition	No	No
Fall detection
Fall detection	No	No
Crash detection
Crash detection	No	No
GPS
GPS	Single-band	Single-band
Water resistance
Water resistance	–	50 m
Sensors
Sensors	High-sensitivity GPS receiver; optional ANT+ heart-rate chest strap, foot pod and cycling speed/cadence sensor. No optical wrist sensor.	Garmin Elevate wrist heart rate; Pulse Ox; accelerometer; ambient light sensor; no built-in barometric altimeter or body-temperature sensor
Health features
Health features	–	Continuous heart rate with high/low alerts; HRV status; Body Battery; stress and respiration; advanced sleep, sleep coach, breathing variations and nap detection; smart wake alarm; Health Snapshot; lifestyle logging; Health Status; women's health tracking via Garmin Connect; no ECG app
Fitness features
Fitness features	Pace, distance, time, calories, custom and interval workouts, Virtual Partner, Auto Lap and Auto Pause.	More than 80 sports apps; training readiness, status, load, load focus and recovery time; Garmin running, cycling and strength coaching; daily suggested running workouts including run/walk; quick workouts; wrist-based running dynamics and running power; PacePro; VO2 max and race predictions; breadcrumb course navigation, back-to-start and TracBack; pool swimming; no open-water swim or triathlon mode; no full offline maps
Safety features
Safety features	Stores up to 100 locations and provides direction to a saved location; no base maps.	Incident detection during selected activities, assistance and LiveTrack require a paired compatible smartphone; live event sharing is Android-only; screen flashlight, not a separate LED torch
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 8 hours	Up to 13 days
In low-power mode
In low-power mode	Up to 14 days	Up to 28 days
Mobile data option
Mobile data option	No	No
Works with
Works with	No phone pairing	iPhone and Android
Battery life detail
Battery life detail	Rechargeable lithium-ion battery; approximately eight hours with GPS or two weeks in power-save mode.	Smartwatch up to 13 days, or 5 days with display always on; battery saver smartwatch up to 28 days; GPS-only GNSS up to 23 hours; all-systems GNSS up to 16 hours; actual life depends on enabled features and usage
Charging
Charging	Contact charging clip and AC adapter.	Garmin proprietary plug charging/data cable; rechargeable built-in lithium-ion battery; USB charging temperature 0–45 °C
Connectivity
Connectivity	ANT+ Sport wireless data transfer to a computer through a USB ANT stick; Garmin Connect and Garmin Training Center analysis. No direct phone pairing.	Bluetooth and ANT+; GPS, GLONASS and Galileo; no multi-band GNSS; Android-only text responses and notification images; Connect IQ apps/watch faces/data fields; Garmin Share; controls smartphone music without offline playback; no Garmin Pay, speaker/microphone calls or cellular connection
Storage
Storage	Around 1,000 lap records; Garmin Taiwan quotes approximately twenty hours of track points at one point every four seconds.	512 MB memory/history; not storage for offline music playback
Design
Weight (lightest version)
Weight (lightest version)	60 g	40 g (better)
Software
Software	Garmin	Garmin
Case materials
Case materials	IPX7 immersion protection, one metre for thirty minutes; not intended for swimming.	Fibre-reinforced polymer bezel; silicone band; chemically strengthened glass; 5 ATM water rating; operating/storage temperature –20–60 °C
Size
Size	48 × 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.	42.6 x 42.6 x 11.9 mm; Garmin lists 40 g without a separate body-only weight
Bands
Bands	–	Standard 20 mm quick-release silicone band; fits 126–203 mm wrists
Colours
Colours	–	UK Black, Whitestone, Citron and Cool Lavender; global range additionally offers Tidal Blue and Soft Pink
In the box
In the box	Watch, USB ANT stick, AC charger and manual; heart-rate strap included in some bundles.	Forerunner 70; charging cable; documentation