Topeak PanoBike Bluetooth Smart Speed and Cadence Sensor TPB-CS01

Battery CR2032 x 1 (included)
Battery Lifetime (Approx) 900 hr
Mount Chainstay
Size 5.4 x 3.3 x 1.2 cm / 2.1??x 1.3??x 0.5??
Tech Bluetooth® Smart super low energy technology
Transmission Range < 5 meter (16.4 ft)
Weight 21 g / 0.74 oz
Waterproof IPX 5