Gefei, Casta and Luchang, what's the difference between these three brands of DVD navigation? Which is better?

The main quality and performance are stable, the sound quality is good, and you can adjust your favorite tone. Using DSP audio processor 2, Casta/ Kejunda (Guangdong Good Helper Electronic Technology Co., Ltd., Guangdong famous brand, Guangdong famous trademark) Casta is the earliest DVD navigation industry in China, with mature technology, good quality and many functions. 3. Luchang Land Rover (Shenzhen Luchang Technology Co., Ltd., one of the earliest enterprises in the GPS navigation industry in China) was once mainly used in 4S stores, with high cost performance and stable quality. Look where you are. I have a national chain store here. They have physical stores all over the country. You can go to "China Auto Supplies Online" to find out. The name of the store is "Yi Jie Automobile Service Chain". This shop is relatively large in scale, with complete products and professional construction. The overall price is relatively advantageous. The most outstanding thing is their good service attitude. This is commendable. I installed it in Yi Jie Direct Store in Changsha, Hunan. Address: Building D8, Yin Gang Crystal City, Mawangdui, Changsha (intersection of Lingxiao Road and Jiayu Road), where Hunan Branch is located. I hope it helps you.