Uniden Set of 2 Compact 22 Channel Two-Way Radios Walkie Talkies TR622-2. The rechargeable batteries need to be replaced. NIMH BP38 are the batteries that need to be replaced. These also work with four (4) AAA batteries. I tested both walkie Talkies with fresh AAA batteries and they both work great. Serial number 895Z34107992 Below is the official description from Uniden. The Uniden TR-622-2 supports all 22 FRS/GMRS channels and 38 privacy codes. The TR-622-2 has a maximum range of up to 2 miles. It also supports the channel scan feature, and allows you to choose from 5 call tones. Each Uniden TR-622-2 two way radio requires 4 AAA batteries, which are not included. This value pack includes two Uniden TR-622-2 two way radios, one desktop charger, and NiMH rechargeable batteries for each radio. (Note : you will need to replace the chargeable batteries included with this listing.) Uniden TR-622-2 Features 22 Total Channels 2 Mile Range 14 FRS Channels 8 GMRS Channels 38 Privacy Codes .5 Watt Output Power Uses 4 AAA Batteries or Rechargeable Battery Pack 2 NiMH Rechargeable Battery Packs Included (NEED TO BE REPLACED) Desktop Charger Included 5 Call Tones Channel Scan Auto Squelch Backlit LCD Display Battery Strength Meter Low Battery Alert Battery Saver Keypad Lock Channel Monitor Drop-In Charge Capable Included with the Uniden TR-622-2 Two Uniden TR-622-2 Radios Two NiMH Battery Packs Dual Drop-In Charging Cradle Belt Clips