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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of property and equipment over estimated useful life

​

Electronic equipment		3 – 5 years
Machinery and equipment		10 years
Furniture and fixture		5 years
Transportation vehicles		4 years
Leasehold improvements		Over the shorter of the expected lease term or useful lives

Schedule of intangible assets useful life

​

Software		3 – 10 years
Technology		3 – 8 years

Schedule of accrued warranty liability

​

​	​	​	​	​	​	​
​	​	For the Year ended December 31,
​		2021		2022		2023
​	​	RMB	​	RMB	​	RMB
Balance as of the beginning of the year		10,042		13,932		17,694
Warranty provision		10,766		8,467		26,247
Consumption		(6,876)		(4,705)		(15,516)
Balance as of the end of the year		13,932		17,694		28,425

Schedule of impact on the combined and consolidated balance sheets upon adoption of ASC842

​

​	​	​	​	​	​	​
​	​	December 31, 2021	​	January 1, 2022
​	​	​	​	Effect of the	​	After adoption
​		As reported		adoption of ASC 842		of ASC 842
​	​	RMB	​	RMB	​	RMB
ASSETS	​	​	​	​	​	​
Right-of-use assets		—		36,030		36,030
TOTAL ASSETS		—		36,030		36,030
LIABILITIES AND SHAREHOLDERS’ EQUITY						​
Accrued expenses and other current liabilities		569		12,566		13,135
Lease liabilities, non-current		—		23,464		23,464
TOTAL LIABILITIES		569		36,030		36,599
TOTAL LIABILITIES AND SHAREHOLDERS’ DEFICIT		569		36,030		36,599

Schedule of concentration of risks

Concentration of customers

The following customers accounted for 10% or more of revenue for the years ended December 31, 2021, 2022 and 2023:

​

​	​	​	​	​	​	​	​
​	​	For the Year ended
​	​	December 31,
​		2021		2022		2023
Customer A		*	​	24.3	%	25.6	%
Customer B	​	17.5	%	13.7	%	28.4	%
Customer C		12.7	%	*	​	*	​

​

The following customers accounted for 10% or more of the Group’s accounts receivable, contract assets and amount due from related parties as of December 31, 2022 and 2023:

​

​	​	​	​	​	​
​	​	As of December 31,			​
​		2022		2023
Customer A		61.0	%	41.3	%
Customer B		15.3	%	10.2	%
Customer D		*	​	11.2	%

Concentration of suppliers

The Group has one supplier accounted for 10% or more of purchases for the years ended December 31, 2021 and 2022:

​

​	​	​	​	​	​	​	​
​		For the Year ended December 31,
​		2021		2022		2023
Supplier A	​	13.7	%	12.3	%	*	​

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