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 Phone Material: ABS Frequency Band Suitable For: GSM 2G 850 900 1800 1900MHZ Display : 0.66 Inch Organic Light Emitting Diode, 64x48 Standby Time: 20 Hours Built in Battery: 380mah Lithium Battery Product Size: Approx. 6.9 x 2.8 x 1.3cm/2.7 x 1.1 x 0.5in Multi 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 Manual Note: 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.Open the back cover of the product, remove the yellow tape on the battery, and then put it into the product to charge. After it is fully charged, long press the phone hang up button (the second key in the positive number on the right side) to turn on the phone.