20W 4 Ohm Full Range Speaker XS-GTF1027 SF_Sound Up to 4 Relay with

Up to 4 Relay with photo-coupled circuit

and it cannot be immersed in an oxygen-free environment

2V kind) but we suggest our 1200mAh capacity or 2000mAh capacity batteries

5 analogous 30 mA 220 mA 5 mm This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection)

Aluminum capacitor(100uF x 5)

20W 4 Ohm Full Range Speaker XS-GTF1027 SF_Sound Up to 4 Relay withListen up! This high power 4" diameter speaker will amp up any audio project where you need loud sound! It is 4 ohm impedance, rated for 20W continuous power. (This thing is really loud) It also has four handy mounting tabs 3 inches apart, and a grill that fits on top. The grill is to protect the cones, and is not necessary for use. This speaker has a nice wide range of 60Hz 24kHz, which is pretty good for a speaker this large. Originally designed for