ELAH Waterproof Bluetooth Bicycle Speedometer Riding Time Calories Monitor 

Features:
Can be set cycling plan
Waterproof design
Record riding speed, time and calories
Combine phone, stopwatch, GPS, music player, camera and heart rate monitoring and other functions

Specifications:
Weight: 50g
Color: Black
Bluetooth 4.0
Model Number: BT-003
Battery: 1 x CR2032 (Not included)
Transmission distance: <3 m
Size: 103mm * 69mm * 22mm
Application platform: Android platform, Apple ios platform

Package Content:
1 x Speedometer