How long do batteries last?

That would depend on the type of battery. I find Duracell to be the longest lasting, as well as how frequently and how long you have the radio on.

If it is on and the electric goes off will the radio be on when electric comes back on? I want to put it on a timer.

Not sure, but I believe it would be on. It is a very simple on/off switch - not digital. If switch is on & radio playing & electric goes off, it should be on when electric comes back on. It is a nice radio with great reception.

Does this have a dsp chip ?

This is such a simple cheap radio, I can't imagine it being digital. Analog I bet (I don't know for sure). Plays well but has zero options. Could have been made in 1970.

Brand	Yewrich
Manufacturer	china
Model	YR-R18
Product Dimensions	20.62 x 7.32 x 13.36 cm; 762 g
Item model number	YR-R18
Hardware Interface	3.5mm Audio
Tuner Technology	AM, FM
Compatible Devices	Headphone, Smartphone, MP3 Player
Special Features	Portable
Display Type	analog
Speakers Maximum Output Power	2 Watts
Voltage	110 Volts
Power Source	Battery Powered
Batteries Included	No
Batteries Required	Yes
GSM frequencies	108 MHz
Connector Type	Auxiliary
Radio bands supported	2-Band
Manufacturer	china
Country of Origin	USA
Item Weight	762 g

AM FM Radio, Portable Battery Operated Transistor Radios, AC Powered, Suit for Senior and Home, Black

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