What is the driverless ac cob led chip?
A: Oh! Long time no see,my friend!!
B: Oh ,yes,I haven't seen you for half a year.
A: You look very excited, what happened to you?
B:Yes!!Good new!!I'm developing a light source accessory that is more convenient and safe to install.
A:What's this?
B: It's .........
(To be continued)