certificate: 3C

battery: 1.5vaaa * 3 tablets (battery needs to be provided by yourself) sound effect: 1 pure song

6, size problem: all dimensions are measured manually,1-2cm the error is normal.

7, others: all perfectionists or those who have strict requirements on products, please turn around and make a detour. Our store does not accept products with strong plastic feeling, peculiar smell, and details are not fine enough, there are reasons such as rough edges to ask for a refund or exchange or bad review.