Dimensions
Size comparison
Echo Show 21R3S
| Echo Show 21 | R3S | Difference | |
|---|---|---|---|
| Height | 340 mm | 167 mm | +173 mm |
| Width | 540 mm | 420 mm | +120 mm |
| Depth | 38 mm | 220 mm | −182 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is Echo Show 21 better than R3S?
Echo Show 21 has no measurable advantages in this pair.
Why is R3S better than Echo Show 21?
R3S has no measurable advantages in this pair.
Specifications
Side by side
| Sound | ||
| Output power | — | 30 W |
| Lowest frequency | — | 40 Hz |
| Highest frequency | — | 20,000 Hz |
| Battery & charging | ||
| Mains powered | Yes | Yes |
| Battery powered (portable) | No | No |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | — | 5.2 |
| Bluetooth codecs | — | SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | — | No |
| aptX | — | No |
| LDAC | — | No |
| 3.5 mm jack / AUX | — | Yes |
| Optical input | — | Yes |
| Smart & streaming | ||
| Wi-Fi | Yes | Yes |
| Spotify Connect | — | Yes |
| Voice assistant | Alexa | — |
| Voice assistant built in | Yes | Yes |
| Screen | Yes | — |
| Companion app | — | Yes |
| Design & build | ||
| Weight | — | 5,300 g |
| Width | 540 mm | 420 mm |
| Height | 340 mm | 167 mm |
| Depth | 38 mm | 220 mm |
| Colours | Black | — |
