71910 Welch Allyn 3.5 V Lithium Ion Handle, for Use with Universal Desk ChargerTwice the on time, half the weight, and fits more comfortably in your hand. Power Handle Only Handle is NOT Returnable. Features Half the weight of traditional 3. 5 V handles Fits all Welch Allyn 3. 5 V instrument heads Quick turn USB Charging Module plugs into any USB port and is easy to remove on and off with a 90 degree turn 120 minutes of on time (compared to 60 minutes for standard NiCad handles) Low battery indicator Features lithium ion battery