What's in the box:

IGPSPORT SPD61 ANT+ BT Speed Sensor Bicycle Computer Stopwatch Bike Accessories (Standard)

Easily collect real time speed and cadence data to help optimize your cycling performance.

Features:
SHOCKPROOF: Resistant to 1.5m fall naturally.
WIRELESS: BT4.0 / ANT+ wireless transmission protocol.
LONG BATTERY LIFE: Normal use for one year (an hour per day).
IPX7 RATING: Allows for riding in rainy days.
COMPATIBLE DEVICES: IGS2OP, IGS30, IGS216, IGS60; EDGE500/510/520/800/810/1000.
Easily collect real time speed and cadence data to help optimize your cycling performance.

Specification:
Model: SPD61
Color: Black
Material: ABS
IP Rating: IPX7
Power: 1 * 3V / 120mAh CR2032 (Included)
Wireless Transmission: ANT+ wireless communication protocol (more than 3.0m)
Item Size: 37 * 36 * 10mm / 1.5 * 1.4 * 0.4in
Net Weight: 9.5g / 0.3oz (with battery)
Package Size: 102 * 81 * 26mm / 4.0 * 3.2 * 1.0in
Package Weight: 36g / 1.28oz

Package List:
1 * Speed Sensor
1 * Silicone Pad
1 * CR2032 Battery
1 * Strap
1 * User Manual