Gikfun 5mm 940nm LEDs Infrared Emitter and IR Receiver Diode for Arduino (Pack of 20pcs) EK8443 Diameter : 5MM wavelength:940nm 10pcs IR EMITTER 10pcs IR RECEIVER Diameter : 5MM, Wave length:940nm Forward Voltage: 1.2-1.3V, Power: 0.15 W Receiving Angle: 40 degrees Voltage (VF) : 1.1-1.4 V (0.1 V each file) Receiving tube (limit parameters (Absolute Maximum Ratings) (Ta = 25 ). Storage temperature: - 25 ~ + 80 Transmitting and receiving distance: about 7 - 8 M. Maximum power: 70 mw; Maximum forward current: 30 ma; Maximum reverse voltage: 5 v; Maximum pulse current peak: 75 ma; Welding temperature/time: 260 / acuities 5 S Working environment: - 25 ~ + 70