SMA B2 USB Charging Smart Watch Bracelet with Hear Rate Monitor - Green Controllers you are not suggested to

you are not suggested to adjust volume of your car speaker to maximum (this will bring lot noise)

it will automatically alarm

1 x Nano Development Board

Total current output: 5V 18A

but keeps the interaction simple and intuitive

SMA B2 USB Charging Smart Watch Bracelet with Hear Rate Monitor - Green Controllers you are not suggested toColor Green Model B2 Quantity 1 set Material TPU Water proof IP67 Bluetooth Version Bluetooth V4. 0 Touch Screen Type AMOLED Operating System Android 4. 4,Android 4. 4. 1,Android 4. 4. 2,iOS Compatible OS Android 4. 3 iOS 7. 0 and above system Battery Capacity 80 mAh Battery Type Li polymer battery Standby Time 300 hours Packing List 1 x Smart Watch 1 x Charging Cable 1 x English User Manual Dimensions: 9. 06 in x 0. 79 in x 0. 39 in (23. 0 cm x 2. 0