Refill here: https://www.passiongadgets.com/xiaomi-mijia-mosquito-repellent-tablet-mat-refill/

Basic Version

Features:
- One-Button Operation: Powering on/10 hours Timing Mode/ Auto Power Off
- Low to 24dB(A), ensure your sleep for whole night in summer.
- Single Repellent Tablet for 28 square meters space.
- The Fan Driver can promotes odor evaporation, low stimulation, no smoking and harmless.
- Powered by AA battery, up to 720hours MAX effective time
- Indicator light on/flashing to show you the working status, convenient for use.

Specification:
Brand: Xiaomi
Product: Mijia Mosquito Repellent Basic Version
Model: WX07ZM
Material: ABS+PP
Color: White
Rated Voltage: 3.0V
Rated Power: 0.06W
APP: Not Support
Product Weigh: Approx. 133g/4.69oz
Product Size:  Approx. 9.65*9.65*5.27cm/3.87*3.87*2.29in
Package Weigh: Approx. 350g/5.64oz
Package Size:  Approx. 12*12*7cm/4.70*4.70*2.76in

Note:
1. The tablet can be used for 90 days, 8 hours a day.

Package list
1 piece pack:
1 * Mosquito Repellent
1 * Tablet
2 * AA Battery

3 pieces pack:
3 * Mosquito Repellent
3 * Tablet
6 * AA Battery

Smart Version

Features:

• Can be connected to the Mijia APP via Bluetooth connection;
• Can be turned on and off at any time through the APP
• you can also check the remaining amount of mosquito repellent tablets and remaining power；
• 1 mosquito repellent Tablet can meet the maximum space usage of 28 cubic meters
• Built-in rotating fan promotes the volatilization of medicines, without heating, safer to use
• Noise as low as 24dB (A), do not disturb sleep
• Powered by two No. 5 batteries
• One piece of mosquito coil can be used for 90 nights
• Support cyclic timing work,Start once, start and end work at a fixed time every day

Specification:
Brand: Xiaomi
Product: Mijia Mosquito Repellent Smart Version
Model: WX08ZM
Material: ABS+PP
Color: White
Rated Voltage: 3.0V
Rated Power: 0.06W
APP: Supported
Product Weigh: Approx. 133g/4.69oz
Product Size:  Approx. 9.65*9.65*5.27cm/3.87*3.87*2.29in
Package Weigh: Approx. 350g/5.64oz
Package Size:  Approx. 12*12*7cm/4.70*4.70*2.76in

Note:
1. The tablet can be used for 90 days, 8 hours a day.

Package list
1 piece pack:
1 * Mosquito Repellent
1 * Tablet
2 * AA Battery

3 pieces pack:
3 * Mosquito Repellent
3 * Tablet
6 * AA Battery