Precise details:
Features:

ã€Remote Control】Control the connected devices remotely when there is no Wi-Fi connection, no need to find your phone anymore.
ã€Powerful Compatibility】Suitable for devices supporting RF433MHz communication protocol.
ã€Easy To Pair & One-Key Pairing】D1 Wi-Fi smart dimmer and iFan03/iFan04 Wi-Fi Fan & Light Controller can be one-key paired by RM433R2, pair and control the devices with 8 buttons in a minute.
ã€Smooth Touch & Easy Installation】Sleek and modern design and fast installation with 3M adhesive tape or screws.
ã€User-Definable】8 buttons can match 8 devices or more as you defined, only one RM433R2 can meet all your needs.
Specification:

Applicable place: Indoor
Power supply: 3V button cell x1( battery model: CR2450)
Working temperature: -10°C~40°C
Working humidity: 5%-95% RH, non-condensing
Working Voltage: 12V removable battery (Model: 27A)
Number of keys: 8
Casing material: PC V0
Installation method: Installed on 86 type junction box with RM433-BASE
Matched devices: SONOFF D1, SONOFF iFan03/iFan04
Functions: The RM433 applies to all SONOFF products with 433MHz frequency and other devices supporting the 433MHz communication protocol.
RF: 433MHz
Dimension: 86 x 45 x 12.5mm
Weight: 35g
Color: White
Certification: CE/FCC/ROHS

Package Included:
1 x RM433R2 Remote Controller