Battery Rechargeable Rechargeable Rechargeable Rechargeable Rechargeable with disposable options Rechargeable Rechargeable and disposable Rechargeable Disposable Rechargeable and disposable
Bluetooth Yes No Yes
for adjustments only, no streaming
 Yes
for adjustments only, no streaming
 Yes (except the Mini) Yes Yes
adjustments only, no streaming; iPhone call streaming through B2 model only
 Yes No Yes
Warranty 3 years (Enhance Select 50R, 300, and 500) 1 year 1–2 years 1 year 2 years 1–3 years 1 year Depends on retailer 2 years Depends on retailer
Financing Yes No Yes Yes Yes Yes Yes Depends on retailer Depends on retailer Depends on retailer