1.Max 99 minutes available for you to self-set auto-switching time. 2.Set auto-switching time with two numbers separately. 3.Display your SIM1 or SIM2 phone numbers on screen (ID number editable). patible with all GSM mobile 5.Economical & convenient, enjoy the freedom of two mobile numbers in one handset! 6.Ultra slim design with advanced IC guarantees stable performance. 7.Save money by easily alternating between local numbers of 2 different cities/networks, allow you to call out economically by one numbers, and answer freely by another number. 8.Separate business call from private call; offer you more space, freedom & privacy. 9.Six-Month Limited Warranty (Damages caused by inadequate operation is not included). 10.100% Satisfaction Guaranteed. 11.The newest temperature testing function. 12.Maintain their original STK function.