IGS618 - GPS: High sensitive GPS+ Beidou+Glonass. - Screen : 2.2 inch anti-glare LED color screen, 240 x 320 pixels. - Physical dimension: 85 x 53.5 x 18.8mm. - Waterproof: IPX7. - Memory: About 700 hours' data storage (typical usage). - Data format: Fit. - Data display: 1-10 cycling data columns can be customized in single page & 1-6 pages can be customized & More than 80 cycling data for selection. - Battery: Rechargeable, built-in lithium-ion battery. - Battery life: About 22 hours (typical usage). - ANT+: Support ANT+ Heart Rate Monitor, Speed Sensor, Cadence Sensor, Cadence and Speed Combined Sensor, Power Meter. - Interface: Micro USB. - Wireless transmission: Bluetooth 4.0. - Weight: About 90g.