The Welch Allyn 3.5V Rechargeable Lithium-Ion Handle is crafted for compatibility with interchangeable Welch Allyn 3.5V diagnostic heads. For efficient use, the 3.5V pod charger, universal charger, and power transformers enable rapid charging of all Welch Allyn 3.5V handles, encompassing both NiCad and Lithium-Ion variants.