Garmin Forerunner 101 vs Garmin Forerunner 205

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Forerunner 101 compared with Forerunner 205

	GarminForerunner 101	GarminForerunner 205
Overview
Released
Released	2004	2006
Display
Case sizes
Case sizes	83 mm	53.3 mm
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	Backlit 36.49 × 23.35 mm monochrome display, 100 × 64 pixels, operated with physical buttons. Garmin does not identify the panel technology.	Backlit 33 × 20.3 mm monochrome display, 160 × 100 pixels; configurable training screens and physical buttons. Panel technology is not specified by Garmin.
Health and fitness
ECG
ECG	No	No
Blood oxygen
Blood oxygen	No	No
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
Sensors
Sensors	Twelve-channel GPS receiver with built-in patch antenna; no heart-rate or cadence sensor support.	High-sensitivity SiRFstarIII GPS receiver with antenna wrapped towards the sky; the 205 does not support the heart-rate or speed/cadence accessories of the 305.
Fitness features
Fitness features	Time, distance, pace and calorie tracking; Virtual Partner, interval training, Auto Pause, Auto Lap and pace, time and distance alerts.	Running, cycling and other-sport profiles; quick, interval and advanced workouts, course racing, Virtual Partner, Auto Pause, Auto Lap and pace, time and distance alerts.
Safety features
Safety features	Stores 100 locations and offers basic route display and navigation back to the start; no detailed base maps.	Stores 100 locations and 50 routes; basic route display, direction to a stored location and navigation back to the start. No base maps.
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 15 hours	Up to 10 hours
Mobile data option
Mobile data option	No	No
Works with
Works with	No phone pairing	No phone pairing
Battery life detail
Battery life detail	Two replaceable 1.5 V AAA batteries; fourteen to fifteen hours of typical use according to the owner's manual.	Internal rechargeable lithium-ion battery; ten hours of typical use.
Charging
Charging	–	Docking cradle with AC charger and USB cable.
Connectivity
Connectivity	No computer interface or direct phone pairing; history is viewed on the watch.	USB computer transfer through the cradle; Garmin Training Center software and MotionBased analysis were supplied at launch. No direct phone pairing.
Storage
Storage	Up to 5,000 laps and approximately two years of training history.	Up to 1,000 laps; smart recording or one-second recording.
Design
Weight (lightest version)
Weight (lightest version)	74 g (better)	77 g
Software
Software	Garmin	Garmin
Case materials
Case materials	High-impact plastic alloy housing; IPX7 immersion protection, one metre for thirty minutes. This is not a swimming watch.	IPX7 immersion protection, one metre for thirty minutes; the owner's manual says it is not intended for swimming.
Size
Size	83 × 43.5 × 23 mm; 74 g including batteries, according to Garmin's series datasheet. Width is used as the case size.	53.3 × 68.6 × 17.8 mm and 77 g. Width is used as the case size.
Bands
Bands	Adjustable wrist strap.	Vinyl wrist strap with an expander strap; fabric strap available separately.
In the box
In the box	–	Watch, wrist and expander straps, docking cradle, AC charger, USB cable, Garmin Training Center software and documentation.