Also, (and in my opinion) the Oticon Alta hearing aids are too old and not very good. Digital hearing aid technology has seen significant improvements over the past decade. I would not recommend any Oticon hearing aid model that is older than Opn, and avoid (Opn ZPower) junk. Sorry; I hope this doesn't offend you 
Here's a clip from a DIY School Hearing Aids PDF file named (Big-5 Platforms Chips) listing the Alta's from the Inium platform from a decade ago.
William DeMant/Oticon, Bernafon, Philips, Sonic
| 2024-Q1 | Sirius | 2024-Q1 Intent miniRITE; new Lithium-ion charger technology - has contacts - is not inductive charging, new miniFit Detect speakers - not miniFit speakers |
| 2020-Q4 | Polaris | 2023-Q1 Real miniRITE R, miniRITE T, miniBTE R, miniBTE T
2022-Q3 Own IIC, CIC, ITC, ITE-HS, ITE-FS
2022-Q2 Zircon miniRITE R, miniRITE T, miniBTE R, miniBTE T
2022-Q2 More miniBTE R, miniBTE T
2020-Q4 More miniRITE R, miniRITE T |
| 2019-Q1 | Velox S * | 2020-Q2 Ruby, miniRITE, miniRITE T, miniRITE R, BTE, BTE Power Plus
2019-Q2 Xceed, Xceed Play
2019-Q1 Opn S, Opn-Play |
| 2016-Q2 | Velox * | 2018-Q4 Siya
2017-Q2 Opn ZPower Rechargeable miniRITE
2016-Q2 Opn |
| 2015-Q1 | Inium Sense | Alta2, Nera2, Ria2, Dynamo |
| 2013-Q? | Inium | Alta, Nera, Ria |
| 2010-Q1 | RISE2 | Agil, Acto |
| 2007-Q2 | RISE | Vigo, Epoq |
*=Firmware Update requires Hi Pro
