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Subsequent events (Details) ¥ in Thousands, kr in Thousands | Aug. 01, 2024 CNY (¥) | Aug. 01, 2024 SEK (kr) | Jul. 15, 2024 CNY (¥) | Jun. 30, 2024
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Hubei Dongjun Automotive Electronics Technology Co., Ltd. |  |  |  |
Subsequent events |  |  |  |
Equity interest percentage |  |  |  | 51.00%
Subsequent events | HaleyTek |  |  |  |
Subsequent events |  |  |  |
Equity interest sold (as a percent) | 40.00% | 40.00% |  |
Cash consideration for sale of equity method investment | ¥ 140,238 | kr 210,000 |  |
Subsequent events | Hubei Dongjun Automotive Electronics Technology Co., Ltd. |  |  |  |
Subsequent events |  |  |  |
Equity interest percentage |  |  | 51.00% |
Amount of cash consideration |  |  | ¥ 23,500 |

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