The GLA Replacement Charger works with both the M700 & M750 series. The thermometer has a charging indicator light. GLA part# C725. 120V
Thermometer Instructions: M750: https://gla-ag.com/pdf/M750%20Instruction%20Manual.pdf
Thermometer Instructions: M700: https://gla-ag.com/pdf/M700%20Instructions%20Manual.pdf