... wavelengths to meet specific requirements. TAM8702 optical light source can provide 1 to 4 output wavelengths ... , 270Hz,1KHz,2KHzmodulation output at other wavelengths.High stability of the output powerStable output wavelengthBacklight LCD ... Optical Light Source, Protective Rubber Boot, 3pcs 1.5V batteries,Instruction Manual, Cotton Tampon and Soft carrying case. china Optical laser Source(light source ...