Sunda International Industrial Co., Ltd. is the professional manufacturer of dual sim card,twin sim cover----double sim card, double sim card holder etc.

1)Switch online or Auto-switch online without turning on-off. Max 99 minutes available for you to self-set auto-switching time(unique)

2)No data lose when switching 2 numbers or turning on-off
3)Super slim design with special general dual sim card IC for stable quality

4)Show Actual number on screen

5) Two numbers both active synchronously (unique) network service provider support needed)
6) Compatible with all GSM cards(including USA the latest 1900HZ SIM CARDS).