Manual for DTL-12BT-1

Brand: NEC

Category: Cordless Telephone

Document Type: Manual

Language: EN

Available Languages: EN , ES

Uploaded: Nov. 21, 2025, 7:30 p.m.

Manual Publish Date: 2008.7

Warranty Information

No explicit warranty period is stated in the provided pages.

About Cordless Terminals

A cordless terminal is a multifunctional terminal that interconnects its Bluetooth® Terminal and Bluetooth® handset with each other using Bluetooth® wireless technology to maintain calls or perform other operations between them.

Key Functions

Bluetooth® terminal headset call: Register a Bluetooth® headset with the Bluetooth® cradle and use it to originate calls to an extension or central office line, or answer terminating calls.
Bluetooth® Handset LCD display: Displays date, time, phone number, radio status, and battery voltage.
Line keys: Allows use of pre-programmed functions on line keys 1 to 8 in the Bluetooth® terminal.
Incoming call/charging lamp: Lights or blinks when calls terminate or the handset is charged.
Key touch tone: Provides audible verification of key clicks.
Tone type: Different ring tones indicate status like charging or standby.
Volume/density control: Adjusts receiver and ring tone volumes, and LCD contrast.
Bluetooth® Handset function: Originates/answers calls, holds/transfers calls, and displays call histories.

Talking Range

About 50m (line-of-sight distance), but may shorten in environments with metal or concrete walls. An alarm tone and disappearing antenna mark indicate loss of range.

Charging

Charge handset for at least 5 hours before first use. Full charge takes 16 hours. Provides 8 hours talk time / 30 hours standby (low-power mode enabled).

Troubleshooting and error codes

Symptom	Point to check	Action
Shut down completely	• Is the Bluetooth® cradle cord out of position? • Is the battery correctly loaded? • Is the battery charged? • Is the handset too far away from the Bluetooth® terminal? (Does the antenna mark in the Bluetooth® handset LCD screen show "Low Strength" or is it off?)	• Inset the Bluetooth® terminal cord firmly into position. • Reload the battery correctly. • The battery may have been exhausted. If the handset still fails when the battery is fully charged, replace the battery. • Get closer to the Bluetooth® terminal to operate.
Ring tone does not sound	• Is the ring tone volume turned OFF? (Does the ring tone OFF appear in the Bluetooth® handset LCD screen?) • Is the battery correctly loaded?	• Adjust the ring tone volume. • Reload the battery correctly.
Voice is disrupted while talking	• Does the antenna mark in the handset LCD screen show "Low Strength" or is it off? • Is there an obstacle, such as a concrete wall, between the Bluetooth® terminal and Bluetooth® handset?	• Get closer to the Bluetooth® terminal to operate. • Move to a location clear of intervening obstacles.
Noise heard while talking	• Is there any home appliance or OA equipment nearby?	• Electrical equipment can be a source of radio interference. Keep apart from electrical equipment.
Calls do not last long than 10 minutes even though the battery has been charged for 8 hours or longer	• Is the Bluetooth® handset correctly seated in the Bluetooth® cradle? • Are the charging terminals dirty? • Has the handset been used within two years?	• Keep the Bluetooth® handset properly seated in the Bluetooth® cradle. • Wipe off dirt from the charging terminals of the Bluetooth® cradle and Bluetooth® handset with a dry cloth. • The battery may have been exhausted if two years have passed since the handset was first used. Replace the battery.
Remote party's voice hard to hear	• Is the Bluetooth® handset receiver volume set low?	• Press the up cursor key while talking to adjust the receiver volume.
It sometimes when the Talk or Conference key are pressed, their respective lamps blink but do not stay continuously lit and the call is not established, with an error tone "pi-pi-pi-pi” sounding from the Bluetooth® handset.	• Radio interference may be at fault. • Is there any source of radio interference nearby? • Is the cradle at least 3m apart from the equipment mentioned in "Locating the Bluetooth® Terminal" (P.1-14)? • Is there any device near the Bluetooth® handset that is mentioned in "Locating the Bluetooth® Terminal" (P.1-14)?	• Press the Talk or Conference key one again. • Keep the Bluetooth® terminal and Bluetooth® handset at least 3m apart from sources of possible radio interference.