Feature:1. DUAL SIM: World's smallest Bluetooth headset mini cell phone supports dual sim Nano cards (or one sim and one memory card) (not included).2. BLUETOOTH MUSIC PLAYER: Mini cell phone can be used as a Bluetooth music player with clear sound, and can also be hung up as Bluetooth headphones.3. LOW RADIATION: Mini button phone radiation rate is 1/7 lower than the general smart phone, it is the best phone to protect pregnant women and babies from signal radiation.4. GSM BAND: Smallest phone is suitable for GSM 850 900 1800 1900MHz ( 2G, 3G, 4G, 5G Sim Cards are available, but must support 2G GSM Frequency).5. VOICE CHANGER: Smallest unlocked phone comes with a voice changer, you can change your voice while talking (this feature requires sim card).Specification:Item Type: Smallest PhoneMaterial: ABSFrequency Band Suitable For: GSM 2G 850 900 1800 1900MHZDisplay : 0.66 Inch Organic Light Emitting Diode, 64x48Standby Time: 20 HoursBuilt in Battery: 380mah Lithium BatteryMulti Language Support: English, French, Spanish, Danish, Polish, Portuguese, Italian, German, Malasian, Dutch, Vietnamese, Russian, Arabic, Hebrew, Thai, Greek, Swedish, Croatian and 24 Other Languages.Package List:1 x Cell Phone1 x Charging Cable1 x Instruction ManualNote:Some sim card carriers already cut off 2G and 3G network, please make sure your sim card supports 2G network if you use it as a standalone phone.