CellMeter 8 is a testing instrument that can detect battery status, and the detection battery type includes most rechargeable batteries. The battery types are:- (lithium- battery), -Po (lithium polymer battery), -Fe (lithium iron battery), Ni-Cd (-cadmium battery), NiMH ( metal hydride battery)Lithium battery type (-Po, -, -Fe), CellMeter 8 can support 2S-8S without additional power supply. Test 1S lithium battery,You need to connect a battery larger than 3S or UBEC 5V to NiCd/ port to working power for CellMeter 8. battery type (NiCd or NiMH), CellMeter 8 can support 4S-8S without additional power supply, if you need to test less than 4Sbattery, you need to connect a 2-8S lithium battery to the Lithium port to working power for CellMeter 8.Colour:BlueMaterial:plasticSize:90 x 58 x 21MM Package Contents:1 x battery testerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.