1.Max 99 minutes available for you to self-set auto-switching time. 2.Display your SIM1 or SIM2 phone numbers on screen (ID number editable). 3.Compatible with all GSM mobile. 4.6-Month Limited Warranty (Damages caused by inadequate operation is not covered). 5.100% Satisfaction Guaranteed. The menu of it as below: SIM1 No. SIM2 No. SW time: 03 Turkic ( English)