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	The gross weight of the optical probe is around 2.2 g 
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	The resoluton is around 850 nm, which is good enough for observing sub-cellular structures like dendritic spines 
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	920 nm femtosecond laser pulses is efficiently transmitted with a specially customized optical fiber for acquiring GCaMP and GFP signals 
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	The optical probe can be installed and detachable easily, which reduces the risk of entanglement of the connecting bundles as the animal moves around 
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	Can be integrated with a removable fast z-scanning module to achieved volumetric imaging for the  neuronal network study 
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	Can be integrated with red and green channel modules for two-channel imaging 
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	Small in overall size, light in gross weight, can be carried on the head of the small animals for imaging under freely moving conditions