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Subsequent events
12 Months Ended
Mar. 31, 2021
Subsequent Events [Abstract]  
Subsequent events
  25 Subsequent events

The company has entered into a lease agreement to lease out part of the Shenzhen factory to a third party starting from April 1, 2021 up to March 31, 2022, with a monthly payment of RMB 112,500 (or approximately $17,000)