Electrical characteristics • Operation humidity10% to 90% (no condensing) • Operation temperature-10 °C to 55 °C (14 °F to 131 °F) Wireless transmission • RF frequency868 MHz • RF modulation2GFSK • RF distance1.6 km (open area) General • Dimension(WxHxD)88× 88 × 32 mm (3.46" ×3.46" × 1.26") • Shell materialPC+ABS • ColorBlue/Red LED flash • 169.5 g (6.0 oz)