TalkShell K1 Hardware Specifications and Moulding Process

Bluetooth version	Bluetooth V6.0
Chipset	Bluetrum AB5736D
Driver unit	Φ6 mm, 16 Ω, composite diaphragm
Microphone	Silicon microphone with ENC noise cancellation for calls
Indicator	Dual-colour blue / green LED
Control	Touch-sensitive metal dome, seven gestures
Wireless	Bluetooth only. No Wi-Fi, no NFC.

Power and charging

Earbud battery	30 mAh per earbud, two earbuds
Case battery	150–230 mAh
Wired input	USB Type-C
Wireless input	Qi wireless charging supported
Battery type	Lithium polymer

On playback and talk time: these figures are measured per production batch, not published as a fixed number here. A single quoted hour figure would be wrong for some batches and misleading for some use patterns — talk time with ENC active differs materially from music playback. Ask for the current batch test report with your sample and compare it against your own use case.

Physical

Complete unit weight	45 g
Material	PC + ABS
Surface treatment	Vacuum electroplating with high-gloss UV coating
Water resistance	IPX5 — jets of water from any direction, not immersion
Retail box	185 × 98 × 25 mm, gross 120 g
Master carton	408 × 263 × 513 mm, 100 pcs, 13 kg, 0.055 m³
Colour finishes	Obsidian Black #242830 · Starlight Silver #C9CFD8 · Vibrant Orange #F07423 · Rose Pink #C2185B

Touch controls

Gesture	Function
Long press, 5 s	Power on / power off
Single tap, left earbud	Volume down
Single tap, right earbud	Volume up
Double tap, either earbud	Answer or end a call; play or pause music
Triple tap, left earbud	Previous track; reject a call
Triple tap, right earbud	Next track; reject a call
Single tap, either earbud	Remote camera shutter

Moulding: cavities and cycle times

This is the section most specification sheets leave out, and it is the one that predicts whether a supplier can actually hold a delivery date.

Part	Cavities	Cycle time	Take-out	Output per machine hour
Case shell	1	43 s	Robot	≈ 84 pcs
Case lid	4	37 s	Robot	≈ 389 pcs
Earbud housing	4	50 s	Manual	≈ 288 pcs

Three things follow from those numbers, and they are worth understanding before a delivery date is promised:

The shell is the bottleneck. A single-cavity mould at 43 seconds produces about 84 shells an hour. The lid and earbud housings, with four cavities each, produce three to four times as many per hour. Capacity planning is therefore a question of how many machines run the shell mould, not how many run anything else.
3,000 shells is about 36 hours of moulding on one machine — which is why the standard MOQ and the moulding set-up cost are tied together rather than being arbitrary.
Earbud housings are taken out manually. That is a real capacity constraint and a real quality control point: manual take-out is where handling marks appear, and it is inspected for.

Plating and coating

The shell goes through vacuum electroplating followed by a high-gloss UV top coat. Two details matter to buyers:

Plating runs colour by colour. A jig load is one colour. Switching colour means unloading, cleaning and reloading — this is the origin of the 1,000 pcs per-colour minimum, and the reason four colours total 4,000 rather than 1,000.
The UV coat is functional, not decorative. It protects the plated layer from abrasion and fingerprints. All four finishes share the same shell geometry and the same mould, so a mixed-colour order does not require separate tooling.

On where plating happens: injection moulding and final assembly are carried out in our own facility in Bao'an, Shenzhen. Electroplating is done by a dedicated plating partner under our own colour standard, with first-article approval on every batch — the plating jigs and the colour tolerance are ours, the bath is theirs. We state this because buyers who inspect factories should know which building they are standing in for which process.

FAQ

Frequently Asked Questions

What Bluetooth version does K1 use?

Bluetooth V6.0, on a Bluetrum AB5736D chipset, with a Φ6 mm 16 Ω composite-diaphragm driver and a silicon microphone with ENC noise cancellation for calls.

How much does the complete unit weigh?

45 g for the case with both earbuds docked. The retail box gross weight is 120 g, and a master carton of 100 pcs weighs 13 kg.

Is the K1 waterproof?

It is rated IPX5, which means protection against water jets from any direction. It is not rated for immersion, so it should not be submerged or worn in water.

What is the battery capacity?

Each earbud has a 30 mAh lithium polymer cell, and the case carries 150–230 mAh. The case charges the earbuds while they are docked, and charges itself over USB Type-C or Qi wireless.

How long does the battery last on a charge?

Playback and talk time are measured per production batch and supplied as a test report rather than published as a single figure, because talk time with ENC active differs materially from music playback. Ask for the current report with your sample.

How long does one case shell take to mould?

The case shell is a single-cavity mould running a 43-second cycle with robot take-out, which is about 84 shells per machine hour. The lid and earbud housings run four cavities at 37 and 50 seconds respectively.

Specifications, and the manufacturing numbers behind them

Electrical and acoustic